P0174 code chevy silverado

Test drive Used Chevrolet Silverado 1500 at home in Ashburn, VA. Search from 489 Used Chevrolet Silverado 1500 cars for sale, including a 2011 Chevrolet Silverado 1500 LT, …

P0174 code chevy silverado. Oct 4, 2012 · Engine Code P0171, P0174. Jump to Latest Follow ... Chevy Silverado EV Forum 2K+ members. Home. Forums. Truck Talk. Engine. Vortec 5300 5.3L V8 ...

Jan 5, 2014 · Ok -Just went through this on mine. Same codes P0171 and P0174. Only 33000 miles. A local GM service manager told me it was probably intake gaskets - I changed them to the FelPro metal gaskets - $70 - Code came back - Put a Solus scanner on it and drove it.

I have lean codes on a 2001 chevy silverado motor is the 4.8 codes are p0174 and p0171. I've changed the valve by tank the valve on the top of the motor PVC valve plugs wires. All of the o2 sensers ne … read moreTest drive Used Chevrolet Silverado 1500 at home in Ashburn, VA. Search from 489 Used Chevrolet Silverado 1500 cars for sale, including a 2011 Chevrolet Silverado 1500 LT, …Jun 7, 2018 ... In this video, we explain what OBD2 code P0174 means and possible ... System Too Lean - Code P0171 or P0174 on Your Car or Truck. 1A Auto ...The most common causes of codes P0171 and P0174 include: Vacuum Leaks: Vacuum leaks occur when there's an unintended gap or hole in the intake system of the engine, allowing extra unmetered air to enter it. This disrupts the air/fuel mixture, leading to a lean condition and triggering codes P0171 and P0174.2004 TB EXT, 5.3 L. The last couple of winters, when the outside air is cold, would throw the P0171, but I never noticed any change in performance, and it would not throw a code on warm days, so I ignored it. This winter, about four times has gone into REP mode. After the first time, I cleaned the MAF sensor—would still throw the P0171 on ...The great American sports car is going electric. GM shared the news this morning, and released the first images of the upcoming electric Chevrolet Corvette. The great American spor...P0174 indicates that your Chevy Silverado is either getting too much air or not enough fuel. A clogged or damaged fuel injector will cause the air-fuel mixture to lean out in one specific cylinder. You may see a cylinder misfire code or fuel injector-specific code with P0174.May 2, 2022 ... 1997 Chevrolet Suburban (Lean codes P0171/P0174) ... System Too Lean - Code P0171 or P0174 on Your Car or Truck ... P0171and P0174 CODES CHEVY VORTEC ...

The 2019 Chevy Silverado 1500 LTZ is the perfect truck for those who want to cruise in style. With its sleek design, powerful engine, and luxurious interior, this truck is sure to ...When the P0171/P0174 code sets, the oxygen sensors are detecting too little oxygen in the exhaust and the control module is adding more fuel ...The P0174 code means that the O2 sensor on bank 2 has recognized a too lean mixture, and the imbalance is too great for the O2 sensor to correct the issue on its …Oct 4, 2012 · Engine Code P0171, P0174. Jump to Latest Follow ... Chevy Silverado EV Forum 2K+ members. Home. Forums. Truck Talk. Engine. Vortec 5300 5.3L V8 ... Oxygen Sensor – The P0175 code is thrown when the B2S1 O2 sensor does not register the right amount of oxygen in the exhaust. The computer will still adjust the air/fuel mixture to compensate. A bad O2 sensor will show a lean mixture more often, though. Mass Air Flow Sensor – Your Silverado’s mass air flow sensor calculates the volume of ...

Dec 16, 2019 · P0443 indicates a problem with the wiring to/from the purge valve or that the purge valve solenoid has a short/open circuit. It typically won’t affect the way that your Silverado runs. You may smell gas. Most commonly caused by a bad purge valve solenoid. Checking the gas cap may just save a lot of time. The following are the most common causes of the P0174 code. Faulty mass airflow (MAF) sensor. Blockage in the fuel filter and fuel injectors. The fuel pump is getting weak. Weakening fuel pressure regulator. The vacuum connector or PCV line may have cracks or damage. Defective oxygen sensor. Issues with PCM.Nov 1, 2018 · P0101 code in the Chevy Silverado is crucial to maintaining your truck’s performance and ensuring it runs efficiently. This code indicates that there is a problem with your truck’s Mass Air Flow (MAF) sensor, specifically, a Range/Performance issue. The most common cause of P0101 is a bad MAF sensor. P0443 indicates a problem with the wiring to/from the purge valve or that the purge valve solenoid has a short/open circuit. It typically won’t affect the way that your Silverado runs. You may smell gas. Most commonly caused by a bad purge valve solenoid. Checking the gas cap may just save a lot of time.

Weaver's hardware fleetwood pa.

8 posts · Joined 2024. #1 · Mar 1, 2024. Hello, 2004, 2500HD, 6.0L, 4X4 with 131,000 miles all original no after market modes. I have P0171 and P0174 codes. My effort. New -. Fuel Tank Pressure Sensor, Gas Cap,Canister Purge Valve, Evap canister vent solenoid, fuel pump (55psi running), Mass flow sensor, air filter. Basically every item new ...These are estimated costs to Fix p0175 Chevy Silverado: Vacuum leak- $100-$200. Air-fuel sensor/ Oxygen sensor- $200-$300. Repairing the exhaust- $100-$200. Fuel pressure regulator- $200-$400. Fuel pump- $1300-$1700. Cleaning the mass air flow sensor- $100. Replacing the mass air flow sensor- $300.The 2015 Chevy Silverado 1500 is a dependable and powerful truck that can handle all your needs. Whether you’re hauling heavy loads, towing a trailer, or just running errands aroun...39 posts · Joined 2017. #1 · Nov 17, 2019. I did a search and did not see anything specific, so here goes. Truck is a 2016 Canyon, 4x4 with the 3.6L, ~94K miles on her. Over the last two weeks, I have starting getting PO171 and PO174 engine codes. I have cleared them, and they return a day or two later.Hi Everyone: So I did the fuel injector cleaning just for the Injectors, the engine ran a little better but still high fuel trims!The engine was full of carb...Hey gang – wanted to share my experience working through the P0171 and P0174 (too lean bank 1 and too lean bank 2) codes. 2003 Tahoe LT 5.3 flex fuel engine, 79,700, bone stock.

P0171 and p0174 2002 Chevy Silverado. Her lately my truck has been pull codes p0171 and p0174. Which is for a lean condition on bank 1 and 2. Their is no vacume leak, the valve gasket is good. I'm thinking it's the mass air flow or the O2 sensors.Mar 10, 2022 ... Chevy silverado, lean code diag with 02 sensors.8 posts · Joined 2024. #1 · Mar 1, 2024. Hello, 2004, 2500HD, 6.0L, 4X4 with 131,000 miles all original no after market modes. I have P0171 and P0174 codes. My effort. New -. Fuel Tank Pressure Sensor, Gas Cap,Canister Purge Valve, Evap canister vent solenoid, fuel pump (55psi running), Mass flow sensor, air filter. Basically every item new ...One of the most common trouble codes with the Chevy Impala is P0174. It indicates that your Chevy Impala is running lean on the bank two side of the engine. P0174 and P0171 (fuel trim lean bank one) are the most frequently seen air/fuel mixture-related codes. If they appear together, it reduces the list of potential causes (more on that in the ...The P0174 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0174 is set in along with the …A failure counter increments if the stuck EGR valve condition is still present. This DTC sets when the counter reaches a predetermined value. This would cause the P0171 and P0174 to set. I have attached three documents that may help, View attachment P1404 EGR Valve Closed Pintle Position.docx View attachment Exhaust Gas …Chevy silverado 2006 4.3 stalling Codes p0118 p0174 p0171 - Answered by a verified GM Mechanic. We use cookies to give you the best possible experience on our website. ... 2004 GMC Sierra 1500 4.8L got P0171 and P0174 codes, Changed MAF Sensor, checked fuel pressure 60 psi.2003 Chevy Silverado CK Engine Code P0171 and P0174 FUEL SYSTEM LEAN BANK 1 AND 2 WHAT IS THE FIX FOR THIS TROUBLE CODES - Answered by a verified Chevy Mechanic. By chatting and providing personal info, ... The trouble codes are p0300 p0174 p0171 on a 2002 chevy 5.3 ...What Causes the P0174 Code? The most common causes of the P0174 code are the following: Vacuum leak due to damaged intake manifold gaskets or punctured vacuum and positive crankcase …

Jun 2, 2021 ... This 2015 GMC was brought in due to rough idle and the MIL on. Scan retrieved codes P0171 and P0174. Problem was under reporting MAF sensor ...

4.3 v6 p0171/p0174 lean bank 1 and 2 codes im stumped. Jump to Latest Follow ... Chevy Silverado and GMC Sierra Forum. 1.4M posts 180.4K members Since 2009 A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, …Feb 12, 2023 · The P0174 code means that the O2 sensor on bank 2 has recognized a too lean mixture, and the imbalance is too great for the O2 sensor to correct the issue on its own. The O2 sensor can correct a fuel mixture of +-15%. If the needed correction is out of this range, the P0174 code will be stored. Jun 22, 2017 ... The first thing I would do is to unplug the MAF. If the MAF is contaminated it will cause lean codes and misfires. If it runs better unplugged ...The P0151 code is an OBD-II diagnostic trouble code that indicates low voltage in the Chevy Silverado's Oxygen (O2) sensor circuit located at Bank 2, Sensor 1 (B2S1). The B2S1 O2 sensor plays a crucial role in maintaining optimal engine performance by detecting the air-fuel ratio in the exhaust, then sending this data to the.Billavista.comP0171 ford p0174 code p0344 silverado chevy p2096 dodge p1273 escape ram diagnosis jeep codes nissan trouble wrangler journey murano Paint codeSilverado chevy battery replacing wont. Check Details 2001 silverado paint codes.Initial diagnosis may display any of these misfire and/or fuel trim related codes: • P0300-P0308 • P050D • P0171 • P0172 • P0174 • P0175 • P2099 • P219A • P219B Service Procedure If during repair an injector replacement is required, it will be necessary to refer to the parts catalog to ensure1999 chevy silverado with p1345,p0171,andp0174 my 1999 chevy silverado with a 4.3 motor has 3 codes. p1345,p0171,and - Cars & Trucks question. Search Fixya. Browse Categories Answer Questions . Cars & Trucks; All Recent ... All of these p1131 p1151 p0171 p0174 codes indicate a problem with a lean condition. This …May 14, 2018 · P0171, P0174, P0300. Hello everyone, first time on this forum but my trucks got me stumped. Im trying to get my truck to pass emissions, but I've got DTCs and that's an automatic fail where I live. The previous owner sold it because he couldn't get it to pass emissions either, so far I've changed the intake manifold gaskets and MAF sensor, the ... 5. Inspect the exhaust system for any signs of damage or blockages. A damaged or blocked exhaust can cause a fuel mixture imbalance, resulting in a P0175 code. 6. Check the oxygen sensor and replace if necessary. A faulty oxygen sensor can cause a fuel mixture imbalance, resulting in a P0175 code. 7.When the P0171/P0174 code sets, the oxygen sensors are detecting too little oxygen in the exhaust and the control module is adding more fuel ...

Wong's tacos midlothian photos.

Jessica watson instagram.

You could be back to too much air (unmetered) causing the lean condition. Are the P0171, P0174, and P0300 the only codes you have stored? Save Share. Like. P. PJesse Discussion starter ... Chevy Silverado and GMC Sierra Forum. 1.4M posts 183.2K members Since 2009 A forum community dedicated to Chevrolet Silverado and GMC …P0174 Chevy Silverado. Incorrect fuel injection operation frequently results in the Chevy Silverado throwing the P0174 code. Typically, a lean engine condition will set off the code. P0174 often doesn’t cause any drivability problems.Chevrolet Silverado 1500: I have lean codes on a 2001 chevy. I have lean codes on a 2001 chevy silverado motor is the 4.8 codes are p0174 and p0171. I've changed the valve by tank the valve on the top … read more. ZZDaryl. Lead Auto Tech.The P0174 engine code indicates that there is an issue with the air/fuel ratio provided to your engine. Unfortunately, there are several reasons for this, ranging from air leaks and …Billavista.comP0171 ford p0174 code p0344 silverado chevy p2096 dodge p1273 escape ram diagnosis jeep codes nissan trouble wrangler journey murano Paint codeSilverado chevy battery replacing wont. Check Details 2001 silverado paint codes.If rough idle (I also got P0300, with P0171, P0174 codes) 1. Check the fuel pressure regulator on the drivers side fuel rail by pulling the vacuum line off. (It is bad if wet with fuel) 2. Check EGR valve is working properly, gasket is good, and the tubes don't have a leak with carb cleaner.The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Module has detected an incorrect gear ratio or neutral condition when the low and reverse clutch and the 4-5-6 clutch is commanded ON. This condition must occur 3 times. P0796 2017 Chevrolet Silverado Code - Pressure Control Solenoid Valve 3 Stuck Off.A P0174 is a code that says it all. Something is wrong with the exhaust, but until its fixed the car will expunge more fuel. However, what if it was the oxyg...Alternatively, intake and exhaust leaks can also throw off your trims leading to such codes. Did you used to get 15 mpg with E85? 2009 GMC Yukon XL SLT 5.3 K5L - 2012 GMC Sierra SLT 6.2 NHT - 2013 GMC Sierra SLT 6.2 GAT. “Woe unto them that call evil good, and good evil; that put darkness for light, and light for darkness; that put bitter …P0174 p0171 p0430 differential lean undesirable egr 03 silverado 5.3 p0174 *solved* Chevy silverado p0171 and p0174 trouble codes P0171and p0174 codes chevy vortec engine. P0171 p0174 p0430 chevyP0171 p0174 autozone diagnostic Maf p0171 silverado p0174 airflow senzor 4runner trouble codes presiune axleaddict simptome rol …The P0151 code is an OBD-II diagnostic trouble code that indicates low voltage in the Chevy Silverado's Oxygen (O2) sensor circuit located at Bank 2, Sensor 1 (B2S1). The B2S1 O2 sensor plays a crucial role in maintaining optimal engine performance by detecting the air-fuel ratio in the exhaust, then sending this data to the. ….

Just got the following codes off my truck when the CEL came on: P0101, P0171, P0174, P0327 I pulled the intake all the way off including the manifold, gave it a good cleaning (including the MAF) and drove it around a bit only to have them come back. ... 2006 Chevrolet Silverado 1500HD 4x4 Metallic Silver, Duraline Bed liner, MT Tires …What Causes the P0174 Code? The most common causes of the P0174 code are the following: Vacuum leak due to damaged intake manifold gaskets or punctured vacuum and positive crankcase ventilation (PCV) hoses; Malfunctioning mass airflow (MAF) sensor; Clogged fuel filter; Failing fuel pump; Clogged fuel injectorsP0101 code in the Chevy Silverado is crucial to maintaining your truck’s performance and ensuring it runs efficiently. This code indicates that there is a problem with your truck’s Mass Air Flow (MAF) sensor, specifically, a Range/Performance issue. The most common cause of P0101 is a bad MAF sensor.Jan 19, 2021 · I have a 2004 Silverado Z71, 5.3 with 154K miles. Other than this problem the ruck runs great. I had the fuel lines and fuel pump replaced two months ago and after that, I started to get the P0171 and P0174 (bank 1 and 2 lean) and the long term fuel trims "LTFT" are 18-25% (both) There were no signs of issues cold or warm. Dec 7, 2019 · 182 posts · Joined 2015. #3 · Dec 7, 2019. 171 and 174 are lean codes both banks as you already know. you need to smoke test the intake system to find the leak. There are a few other reasons that can cause these codes such as a dirty maf sensor, weak fuel pump. Try looking at the brake booster vacuum hose for leaks. The code P0171 and P0174 are system lean codes and are almost always caused by a plugged fuel system or low fuel system pressure. The filter is part of the pump assembly so the first thing I can suggest is getting the fuel pressure tested. It is supposed to be 55-62 psi. Ask Your Own Chevy Question.I had posted on December the 1st in anothers post that I also got the P0171 and P0174 codes, both banks lean. ... Chevy Silverado EV Forum 2K+ members. Home.Aug 10, 2016 · Pulled codes and discovered the "lean codes" P0171 and P0174, There was also a transmission related code, which was not unexpected. Next steps: Removed the transmission and took it for bench rebuild, flushed cooling lines and installed the rebuilt transmission with new torque converter. Cleared codes and road tested. Sold - 2017 Silverado LTZ - Diablo i3, Airaid MIT, E2 Catch Can, 5% Tint, 2.25" Readylift w/ucas, 17x8.5 Icon Alloy Rebound w/ LT285/70r17 Falken Wildpeak, N-fab RS Steps, Borla Xr-1 Cat Back Save Share P0174 code chevy silverado, Dec 24, 2014 · I had posted on December the 1st in anothers post that I also got the P0171 and P0174 codes, both banks lean. ... Chevy Silverado EV Forum 2K+ members. Home. , With its 1950s styling, the 1957 Chevy is a timeless car. This article will show you how to draw this cool classic car in just five simple steps. Advertisement The 1957 Chevy is on..., P0174 code. I ran a P0174 code the other day while driving but the truck ran like normal, had no weird noises, or weird idle. I opened the hood and cleaned the MAF sensor and listened for vacuum leaks but couldn't find anything. I reset the truck but the codes came back after I drive for about an hour. Could use any help., P0171 and P0174 OBD II Trouble Codes. 1 answer. P0131 Gmc HO2S Circuit Low Voltage Bank 1 Sensor 1. P0151 Gmc HO2S Circuit Low Voltage Bank 2 Sensor 1. P0452 Gmc Fuel Tank Pressure Sensor Circuit Low Voltage. P0430 Gmc Catalyst System Low Efficiency Bank 2. 3 answers. 3 answers., P0171 and P0174 occur when the air/fuel mixture on the vehicle gets too lean. They are both thrown when the oxygen sensors detect that there is not enough oxygen in the exhaust. The engine then makes adjustments to compensate and throws these codes, which trigger the service engine soon light., GM may be replacing tens of thousands of Bolt EV batteries, but it won’t have to pick up the tab for most of them. The automaker has reached a deal that will have LG pay nearly all..., An engine code P0171 may be caused by one or more of the following: A vacuum leak in the intake manifold or elsewhere in the engine. A leaking or dirty mass airflow sensor (MAF). An exhaust gas recirculation (EGR) system that is not working properly. A faulty oxygen sensor., Oct 4, 2012 · Engine Code P0171, P0174. Jump to Latest Follow ... Chevy Silverado EV Forum 2K+ members. Home. Forums. Truck Talk. Engine. Vortec 5300 5.3L V8 ... , Oct 18, 2017 · 6 years 6 months ago - 6 years 6 months ago #13991. 2008 Chevy Silverado 2500hd 6.0 P0174 and a p0171 was created by drogan. 2008 Silverado 2500 6.0 has a p0171 and a p0174. Intake was smoked with no leaks truck came to me with 8 new injectors a new fuel pump new map and mass air flow sensor and new intake gaskets. , P0174 is a diagnostic trouble code (DTC) for "Trouble Code Help Diagnostic & Repair". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $169.99 . , The generic description for the P0174 trouble code is System too lean, bank 2, which effectively means the engine is getting too much air or insufficient fuel. As a …, Fixing a Code P0174 on a 2002 Chevrolet Silverado with Ron Bilyeu - YouTube. AVI ON DEMAND. 14K subscribers. Subscribed. 150. 27K views 4 years ago. …, Dec 5, 2021 ... Comments74 ; Check Engine Light? System Too Lean - Code P0171 or P0174 on Your Car or Truck. 1A Auto: Repair Tips & Secrets Only Mechanics Know ..., 2003 chevrolet silverado 5.3 i get a p0171 and p0174 code i have changed fuel filter, have changed spark plugs, have cleaned injectors, tested fuel presure which was 55 at key on and 48 running. i sprayed carb cleaner around intake did not notice anything whAT NEXT, Chevy silverado 2006 4.3 stalling Codes p0118 p0174 p0171 - Answered by a verified GM Mechanic We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them., May 2, 2022 ... 1997 Chevrolet Suburban (Lean codes P0171/P0174) ... System Too Lean - Code P0171 or P0174 on Your Car or Truck ... P0171and P0174 CODES CHEVY VORTEC ..., P0171 and p0174 2002 Chevy Silverado. Her lately my truck has been pull codes p0171 and p0174. Which is for a lean condition on bank 1 and 2. Their is no vacume leak, the valve gasket is good. I'm thinking it's the mass air flow or the O2 sensors., Here are the freeze data points for the last time it threw a code: P0174 rpm 520 load: 17.6 air flow rate: 5.35 gr/sec map sensor: 41 kpa short term fuel trim: 1 0.0 long term fuel trim: 1 7.0 ... A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Come join the discussion about performance ..., 4 days ago ... Code p0174 chevy silverado. Things To Know About Code p0174 chevy silverado. Engine Code P0174: System Too Lean (Bank 2). The fuel system is ..., What causes a p0171 and p0174 code in 2003 Chevy silver - Answered by a verified Chevy Mechanic. We use cookies to give you the best possible experience on our website. ... 2003 chevrolet silverado 5.3 i get a p0171 and p0174 code i have changed fuel filter, have changed spark plugs, ..., You could be back to too much air (unmetered) causing the lean condition. Are the P0171, P0174, and P0300 the only codes you have stored? Save Share. Like. P. PJesse Discussion starter ... Chevy Silverado and GMC Sierra Forum. 1.4M posts 183.2K members Since 2009 A forum community dedicated to Chevrolet Silverado and GMC …, Dec 16, 2008. #1. I have a 2002 Avalanche 1500 with 90,000 miles. Mods include KN filter, Hypertech Power Programmer. Lately the truck has been running VERY rough, throwing the P0171, P0174 and P0300 codes, being way down on power and getting terrible mileage. After doing extensive research here, I checked the O2 sensors, injectors, and did a ..., In this video I have a look at a 2008 Chevrolet Silverado 1500 5.3 that came in with codes P0171 and P0174 indicating that the engine is running lean. It doe..., P0171 and p0174 2002 Chevy Silverado. Her lately my truck has been pull codes p0171 and p0174. Which is for a lean condition on bank 1 and 2. Their is no vacume leak, the valve gasket is good. I'm thinking it's the mass air flow or the O2 sensors., One of the most common trouble codes with the Chevy Tahoe is P0174. It indicates that your Chevy Tahoe is running lean on the bank two side of the engine. P0174 and P0171 (fuel trim lean bank one) are the most frequently seen air/fuel mixture-related codes. If they appear together, it reduces the list of potential causes (more on that in the ..., A vacuum leak is a common cause for the P0175 error code in a Chevy Silverado. Check if you can locate any vacuum leaks by taking a look around. Faulty …, The cost to diagnose the P0174 2018 Chevrolet Silverado code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour., If it’s bad enough, it can cause the engine to run rough. This is not very common, though. You may see P0171 or P0174 with this code if that’s the case. Chevy Silverado P0443 Causes ... Bad Charcoal Canister– A bad charcoal canister might be causing the P0443 code in your Chevy Silverado. The charcoal canister is an essential …, Engine Code P0171, P0174. ... A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more! Show Less . Full Forum Listing., Sold - 2017 Silverado LTZ - Diablo i3, Airaid MIT, E2 Catch Can, 5% Tint, 2.25" Readylift w/ucas, 17x8.5 Icon Alloy Rebound w/ LT285/70r17 Falken Wildpeak, N-fab RS Steps, Borla Xr-1 Cat Back Save Share, Dec 5, 2021 ... Comments74 ; Check Engine Light? System Too Lean - Code P0171 or P0174 on Your Car or Truck. 1A Auto: Repair Tips & Secrets Only Mechanics Know ..., With its 1950s styling, the 1957 Chevy is a timeless car. This article will show you how to draw this cool classic car in just five simple steps. Advertisement The 1957 Chevy is on..., The P0171 and P0174 are pointing to both banks running "lean". This means there is too much air or not enough fuel in the fuel/air mixture. When these codes are set together, there are a few different things that can cause this issue. First- a fuel pressure reading should be taken to ensure the fuel pump is working at normal capacity.