Question about 2001 GMC Sonoma Extended Cab

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My 01 sonoma 2.2 L is reading p0171 could puting a cold air intake. be tha problem is it getting to much air and not enough fuel..

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The 2.2 does not use any type of MAF sensor so the engine doesn't really care about what is before the throttle body.

the Lean code is coming up because the O2 sensor is reading lean more than it is reading rich. This most commonly is caused by a vacuum leak.
another possibility is that the O2 is starting to bias lean. this could be confirmed with a scan tool and some carb spray. While monitoring O2 data spray some carb spray into the throttle body and see if the O2 switches to rich. If it doesn't it is bad.

another possibility is low fuel pressure.

Posted on Feb 18, 2012

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Yes, the Intake may be leaking extra air from a bad seam gasket. The code means there is too much air and not enough fuel reaching 1 or both banks of the engine.

Sometimes unplugging a MAP sensor in the air bonnet will make this code or cause the engine to overcompensate. Clear the codes if you have done work and then test it again if the code reappears.

Sometimes you can spray a water mist on the seams and Vacuum lines to detect leaks while the engine is running. If the RPM changes or stalls you have found the leak.

Posted on Feb 18, 2012

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SOURCE: 1998 gmc sonoma air conditioner - not cold

Check the magnetic clutch is engaged on front of a/c pump, have the motor running, a/c on and fan on high, if the centre hub is static the pump in not switched on, this can happen when the gas pressure gets low.

Posted on Aug 05, 2009

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1 Answer

Failed emissions with 2001 BMW 325i. Codes given were P0313, P0171 System too lean Bank 1, and P0174 System too lean bank 2. What do these codes mean?


Those codes mean the fuel to air ratio is to lean, not enough fuel. This is caused by quite a few things, most common is a intake manifold vacuum leak or other source (like hoses and the brake booster) A problem with the MAF (mass air flow) sensor can cause this as well if it is reading the incoming air volume wrong.

Feb 27, 2017 | 2001 BMW 325i

1 Answer

Replace or remove cat.


Possible causes
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Help with this Tech notes
If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.
The P0171 code could also be caused may be caused by one or more of the following: debris on MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure or Engine Control Temperature (ECT) Sensor reading inaccurate.

Read more: http://www.helpforcars.net/obd_codes/p0171_chevrolet.html#ixzz3tjvehfyV

Dec 08, 2015 | 2004 Chevrolet Avalanche

1 Answer

Code P0171


P0171 - System Too Lean Bank 1 Share
1 ' Add Comment Possible causes
- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
What does this mean? Tech notes
If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.
What does this mean? When is the code detected?
- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel Consumption
P0171 Description
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the Malfunction Indicator Light (MIL) (2 trip detection logic).
Read more: http://www.autocodes.com/p0171.html#ixzz3t65yA9xI

Dec 01, 2015 | 2004 Nissan Titan

1 Answer

2001 GMC SIERRA 1500 4X4 CODES P0171 AND P0174 CHECK ENGINE LIGHT IS ON WONT PASS EMISION


Sometimes this is NOT a O/2 sensor issue ,,,,,If the P0171 is combined with the P0174 code, it's very likely that the problem 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 persist the front oxygen (O2) sensor may need to be replaced.
The P0171 code could also be caused may be caused by one or more of the following: debris on MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure or Engine Control Temperature (ECT) Sensor reading inaccurate,,,,,

Mar 24, 2015 | GMC Cars & Trucks

1 Answer

Diagnostic code p0171


code p0171 refers to system too lean-bank 1===causes --intake /exhaust leak---AIR system MAF/VAF sensor--fuel pressure /pump/ regulator---injectors--HO2S IF the thermostat working ok then the engine will get hot enough up to 85 degrees minimum. May be you have an air lock in the coolant system or the heater control is not opening the flow control to the heater core properly

Dec 31, 2013 | Cars & Trucks

1 Answer

Rough idle vibrates and po171 code service engine soon. jamesrowland9@aol.com


Hi, a Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set.
A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive.


A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

Mar 24, 2011 | Ford Escort Cars & Trucks

1 Answer

I have a 99 gmc sonoma 2.2L running bad spits and sputters and dies alot these 2 codes pop up p0171 and 02htr what are they thanks


P0171 is a lean Oxygen Sensor code. It is trying to tell you that your engine is running lean...not getting enough fuel, or getting too much air. That will cause the poor running and dying. This is most likely caused by a bad vacuum leak. The O2 heater code is probably caused by a failed O2 sensor heater. Sometimes it is caused by an open or short in the O2 sensor circuits, but most of the time it is the sensor itself.

Feb 13, 2011 | GMC Sonoma Cars & Trucks

1 Answer

Is there any recalls on the gas tanks of the 2006 cobalts cause my tank is leaking at the top


Fuel Sys, Driveability, Filters (Air & Fuel)
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Jul 12, 2010 | 2006 Chevrolet Cobalt

2 Answers

Location of iat high input sensor


The iat (intake air temperature) is located on the air filter housing. If its reading high its probably unplugged

May 17, 2009 | 2001 GMC Sonoma Extended Cab

4 Answers

2002 Silverado code PO174


After fighting with mine (2003 GMC 5.3 liter), I believe I have it solved. Mine was throwing P0171 and P0174. Also, there was an occasional p0101. I had a rough idle sometimes right when I started it, but usually after 5 minutes when the fuel system went in to closed loop mode (about 200 RPM swings at idle that slowly went away). Days below 10 degrees were much worse.

I cleaned the MAF sensor, checked fuel pressue, changed spark plugs, and cleaned the throttle body. The code basically means that more fuel is being dumped in by opening the fuel injectors longer. The code is set by the long term trim on the injectors be over 23% (opened 23% longer than they should be based on sensor readings). The extra fuel allows the engine to run with the right air to fuel ratio (not necessarily lean as the code suggests). Causes could be low fuel pressure (from pump, fuel regulator, clogged injectors, and such). Running a scanner on it for several days, everything looked normal.

That is all background. The other cause is that air is being introduced into the intake after the MAF sensor. Extra fuel has to be added for the air that the MAF does not see. I did some digging and found out that the gaskets between the plastic intake manifold and cylinder heads are prone to leaking. I tried to spray throttle body injector around where it might leak to monitor the engine speed, but the air leak seems to be less on warmer days and leaks can occur on the inside edge of the gasket where it is hard to reach with the spray (there are foam ends that open the inside edges to atmosphere). I replaced the gaskets and my long term trim dropped to about 6% from 10% on warmer days to pegged out at 25% on cold days with a cold engine. The work isn't too bad as long as you are patient enough to get the plugs off of the ignitors. I have yet to test it out in cold weather, but I am pretty confident.

Jan 06, 2009 | 1999 Chevrolet Silverado 1500

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