Chevy Codes P0171 And P0174

P0171 and P0174 both indicate that there is a lean condition present in your

Chevy Silverado. By themselves, these are some of the most common OBD2 codes. When they are together, it indicates that the entire engine is running lean.

Your car or truck has either a P0171, P0174 lean fault code or both stored i

n the pc, these codes derive from Oxygen Sensor (O-2) readings. A lean code or codes suggest that there surely is too-much air in the exhaust.

It's possible but highly unlikely that P0171 and P0174 codes are the result

of faulty O2 sensors. If O2 sensors are causing both P0171 and P0174 banks to report a lean mixture, that would mean that both O2 sensors are misreading the amount of oxygen in the exhaust. Not a likely scenario.

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...

GM has determined that a vacuum leak in the foul air tube, intake manifold o

r purge valve may be causing the P0171, P0174 condition. Diagnose P0171, P0174 1. With engine at operating temperature, use a scan tool to check and record Long Term & Short Term

Chevrolet Code P0171 Common Diagnosis Mistakes. It is important to complete

the entire diagnostic process when diagnosing P0171. Many people will replace the air fuel sensor or O2 sensor as soon as they get a bad reading, but the root cause is often a dirty or faulty mass air flow sensor or vacuum leak, thus causing the O2 or A/F sensor to read ...

If oxygen sensor issues are present, these will invariably be indicated by c

odes that relate to one or more oxygen sensors directly. Thus, in the absence of any other codes, the most likely causes of P0171/P0174 will involve engine vacuum leaks. Nonetheless, some other common causes of code P0171 could include the following-

This Tahoe was setting a P0171, P0174, and a P0300. We all know the P0300 is

misfire code which is probably being caused by a lean condition that set the other two codes. The P0171 and P0174 code set criteria is that the long term fuel trim cell must be above 23% for 6 seconds. Three things came to mind when I saw these codes.

The bulletin states that it is very common to see lean codes P0171 & P0174 T

OGETHER, and also a possible missfire code. The catch to this is that GM also changed the gasket material to help fix this problem, and they state that the updated ones are supposed to be teal green, and to not use the orange ones again.

One of the most common trouble codes with the Chevy Blazer is the P0174 code

. This code number references a number that is given to you when you plug your truck into a OBDII scanner. The code is often accompanied by the P0171 code, which has the same set of symptoms, but is for bank one.

Hey gang – wanted to share my experience working through the P0171 and P01

74 (too lean bank 1 and too lean bank 2) codes. 2003 Tahoe LT 5.3 flex fuel engine, 79,700, bone stock.

I turned it off and checked the codes, and got the same P0171 and P0174, in

addition I got the codes P0101 and P0300. I cleared the codes and they havent come back on yet. but still getting the 171, and 174 codes. my truck is 03 silverado 1500 4.8L with around 165K miles. the truck runs great at all speeds except at the stop lights, just idles ...

Engine Code P0171, P0174 Oct 04 2012, 11:37pm Driving home today I got a ser

vice engine light. Called on star and they did their checks and told me it was P0171 and P0174.

The vehicle being worked on is a 2004 Chevy Suburban with a 5.3L engine. It

had multiple trouble codes in memory P0171 and P0174 (fuel system too lean bank 1...

P0171 is triggered by the engine bank 1 “upstream” oxygen sensor and P

0174 is triggered by the engine bank 2 “upstream” oxygen sensor. The oxygen sensor alerts your system when the condition is too lean meaning there’s too much oxygen in the exhaust. The symptoms and causes will help you determine the exact issue and how to fix it.

One of the most common trouble codes with the Chevy Traverse is the P0174 co

de. This code number references a number that is given to you when you plug your truck into a OBDII scanner. The code is often accompanied by the P0171 code, which has the same set of symptoms, but is for bank one. P0174: Fuel Trim System Lean Bank 2

P0171 and P0174 codes. Jump to Latest Follow 1 - 19 of 19 Posts ... I put al

l the intake parts back together and fired it up only to get the two codes mentioned. Back under the hood I realized that I had not tightened one of the clamps well. ... Chevy SSR Forum - where SSR fans discuss modifications, wheel & tire tech, performance and so much more!

So, I then changed the MAF sensor. Again, lots of the P0171, then after a fe

w days, REP again a couple of times. I now pull over, turn it off and restart it and it is OK. After the REP, I then get these readings: P0171 Generic 1. Fuel Trim System Lean 2. Fuel Trim System Lean Bank 1 P0174 Generic 1. Fuel Trim System Lean Bank 2 P0220 1.

I am pulling these codes now. I was only pulling P0171. But I had cleaned my

MAF, Replaced my PCV and ran seafoam through the vacuum line as well as cleaned my TB. Now I get both these. I bought a new fuel filter this evening and going to see about replacing that.

Note that it’s possible to register trouble codes P0171 and P0174 in certa

in circumstances. Even though the powertrain control module (PCM) is built to be able to bring a lean bank 2 condition back to normal, it can only do so up to a certain extent, thus the P0174 code may be needed to alert the user to resolve this issue.

Diagnosing diagnostic trouble codes P0171 (System Too Lean Bank 1) and/or P0

174 (System Too Lean Bank 2) can be tough.

If the P0171 is combined with the P0174 code, it's very likely that the prob

lem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.

If the P0171 is combined with the P0174 code, it's very likely that the prob

lem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.

2007 GMC Acadia SLT 3.6l with 140,000 miles. Recent cylinder #5 misfire. Rep

laced all plugs and #5 coil. Now I have P0171 and P0174 codes accompanied with a traction control off / service stabilitrac on the HUD. Both banks running lean, wondering the cause of this condition after replacing plugs...

My 2002 Chevy Silverado 1500 with a 5.3 keeps giving P0171 & P0174 codes. It

says bank 1 and bank 2 running lean. How can I fix this problem?

my 06 SS with 95K on the clock keeps tripping a code P0174 and P0171 (too le

an both banks) and the traction control light goes on and off occasionally. erased both of them and they keep coming back. any ideas where to start looking? thanks in advance!!!

I have a 2001 chevrolet silverado, 1/2 ton,XXXXX automatic, 4.8 litre. I hav

e codes that keep coming up on my scanner. The codes are P0171,P0174,P1133,P1153, The o2 sensors have just been changed and … read more

The exact code readings were P0174 System too lean (Bank 2) P0171 System too

lean (Bank 1) I've read a ton of different diagnoses but none directed towards the newest body impala.

I've cleared the codes 3-4 times now over the past week and a half and the S

AME TWO codes P0171H and P0174 keep coming back. Sometimes one at a time and other times both at the same time. TIA

Hi everyone. I have a new body style 2007 GMC sierra vortec max and recently

have been getting P0171/P0174 lean conditions in bank 1 and bank 2 and I cant figure it out. SYMPTOMS: Check engine light. Stabilitrak/Traction control off/service randomly comes on, mostly at a stop or lower speeds.

I'm having some issues with DTC codes P0300 and the random P0171 and P0174.

I'm running a Bully Dog GT Gas tuner and KN CAI (recently added and code started shortly after). I've cleaned out the MAF several times, checked the plug wires and coils, check hoses and lines and can't seem to find any issues.

When there are more than 14.7 parts air to 1 part fuel in the air-fuel mixtu

re, a lean condition exists and code P0174 is triggered. The lean condition can be caused by a vacuum leak, which introduces more air into the air-fuel mixture, or by a weak fuel system, which does not input enough fuel into the air-fuel mixture.

Codes P0171 and P0174. This is a discussion on Codes P0171 and P0174 within

the External Engine forums, part of the LSx Technical Help Section category; I have these codes which mean I am running lean on bank 1 and bank 2. I was told that ...

Tried to drive everywhere to get rid of the gas and ran the tank to almost "

E" and then filled up with my reg 91 Shell. Code went off the following day and I erased thenm to be sure and have checked since then. No more P0171 & P0174 codes at all.

First and foremost, start by parking your vehicle on a flat ground and use a

n emergency brake set. Test For Vacuum Leaks. Unmetered air that enters the engine’s intake system can lead to lead mixture code.

1999 Chevy Silverado Codes P0327, P0171, and P0174 Okay guys I'm back with t

he same problem. Here is what I have done since Aug. 2008 I have replaced the MAF sensor, air filter, knock sensor, fuel pump, coil, tps, fuel filter, distributor cap and rotor. But guess what I am still having the same codes in this order P0327,P0171, and P0174. I am ...

First let me address the p0171 and p0174. These are lean codes for the fuel

trim, basicly it means you have a vacuum leak. Most auto parts stores will tell you that the O2 sensors are bad. The older gen III engines have a issue with the intake gaskets leaking.

Last week my check engine light came on. I have a Harbor Freight OBD 2 code

reader and got the codes P0102/P0171/P0174 on the reader. P0102 was the M.A.F. sensor and was replaced.Erased the codes and test drove approx 30 miles and C.E.L. came back on.Rechecked the codes and P0102 is gone.

Code P0171 and P0174 4 Answers. My 07 avalanche is pulling p0171 and p0174 c

odes saying the engine is running too lean. I replaced the intake manifold and they still show. I have a cold air intake on it (not sure if it has to do...

Step 4 - An exhaust leak will allow fresh air to enter the system on the neg

ative pressure side of an exhaust event, this will cause an oxygen sensor to produce a lean reading. An exhaust system manages both pressure and vacuum cycles while an engine runs. To inspect for an exhaust leak, have a helper start the engine and hold the idle at about 1500 rpm, listen for additional exhaust noises ...

P0171, P0174, P0300. Chevy Truck Forum | Silverado Sierra GMC Truck Forums.

P0171, P0174, P0300. ... As an aside, I just recently did a 600ish mile trip in this truck and it didn't hesitate at all, when i cleared the codes before i left all i had was p0171 but after just checking now all 3 are back, also changed the spark plugs, and discovered ...

I have a 2002 chevy tahoe with 5.3 engine and it has code P0171 and P0174 st

ored. Lean codes for bank 1 and 2. I have replaced the fuel pump with A/C Delco pump what could be the problem … read more

OBD-II Trouble Code P0171 System Too Lean. The most important trouble code h

ere and the real identifier that a vacuum leak exists is OBD-II trouble code P0171. P0171 is pretty straight forward in that it tells us that the engine computer has detected unmetered air. The exact definition of P0171 is System Too Lean.

Code P0171 applies to 4-cylinder engines (Bank 1) as they generally have onl

y one bank. If you have a V6 or V8 engine you can also get a P0174 code which refers to Bank 2. When the code says that the fuel system is "too lean," it means that the computer has been adding more and more fuel, which is called Long Term Fuel Trim.

2008 Chevrolet Silverado P0174, P0300 Truck Was Dropped Off With Check Engin

e Light Concern. Pulled Codes And Found All Cylinders Mis-firing One Time Or Another.

99 CHEVY trouble shoot code P0171. LEAN TROUBLE CODES (P0171 or P0174) A cod

e P0171 or P0174 indicate the engine is running lean. This means there is too much air and/or not enough fuel. You can confirm the engine is running lean by looking at Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT). Normally, STFT and LTFT should be plus or ...

P0300 - random misfire , P0171 & P0174 lean code's . All of this means you c

ould have a bad vacuum leak ,low fuel pressure ,clogged fuel filter , Mass air flow sensor problem . Ford 150 P0171 P0174 Trouble Codes vacuum leak water test Low fuel pressure causing P0171 and P0174 trouble code

P0171 - P0174 Codes. Jump to Latest Follow 1 - 7 of 7 Posts. S ... Chevy Cor

vette Forum. A forum community dedicated to Chevy Corvette owners and enthusiasts. Come join the discussion about performance, modifications, racing, restoration, classifieds, troubleshooting, maintenance, and more! ...