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Enginelight on, code P0171,P174 - 2002 Oldsmobile Aurora

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Classic! These codes typically come when the throttle body air plenum gasket cracks. The engine will usually idle rough as well. If it is idling rough, you can spray carborator cleaner around the throttle body with the engine running and you should immediately notice a difference.
The plenum gasket is about $30.00. You need to remove the fuel rails and intake manifold to replace it. Not too bad a job for a garage mechanic. Roughly 2 hours.
I let mine go for about a year before fixing it and was sorry I did after seeing how easy it was to correct. Car runs great now.

Posted on Oct 12, 2010

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Posted on Jan 02, 2017

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Im getting P0171 code- lean .


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I have a 2004 flex fuel tahoe 5.3. P171 and p174. Codes on. Have replaced fuel pump , pressure reg., plugs and fuel filter. Hard to start but runs fine for awhile then starts acting up.


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Changed the mass air sensor and temperature sensor and I have still have codes p171 & p174 on my 96 thunderbird lx hellp


p0171 p0174 indicate lean ...check for vacuum leaks around intake manifold...spray carb cleaner(or brake cleaner if flammable)around intake manifold..if rpm goes up you have a vacuum leak....fix leak ..clear codes and test drive.....at least two drive cycles

Apr 01, 2014 | Cars & Trucks

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Just changed the PLASTIC INTAKE on 2002 Ford Explorer its now has service engine soon. Pulling codes P0171, P0174, P0203. Does anyone know what this could be?


Check your work for vacuum leaks,can't have any

Replace the front oxygen sensors, if they have 100,000
miles on them That is the 171&174 along with vacuum leaks
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PO203 ---is a #3 injector issue

Listen to hear if it ticks-- like the others & compare
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1 Answer

P171 and p174 codes for ford


are the codes p0171 and p0174? p0171 system too lean (bank #1) p0174 system to low ( bank # 2) o2 sensors will go in pairs.

Aug 31, 2010 | 1998 Ford Windstar

1 Answer

Dodge 2004 p171 p174


p0171-- system to lean (bank 1)----p0174-- system to lean (bank 2 ). bank 1 is the side that #1 cylinder is on. bank 2 is the other side. the cause may be bad 02 sensors on both banks, or a exhaust leak. also you may want to check and clean the mass air flow sensor. for the sensor will set the same code as 02 sensors. good-luck!!

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Service recommendation code p0171 p174 sytem too


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2 Answers

1999 Chevy silverado 5.3 engine setting codes p171 p174 already replaced mas air flow and checked for leaks


oxygen sensor failure
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P0174 System too Lean (Bank 2) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
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Feb 02, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

1996 acura enginelight comes on i smelled emission 1996 RL


you need to have the engine codes pulled in the us auto zone and advance do it for free.this is the only way to know what is happening.

Jan 14, 2010 | 1996 Acura RL

2 Answers

99blazer s10 trouble codes p171/p174


P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

A code P0171 may mean that one or more of the following has happened:
  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.
Possible solutions include:
  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure

P0174 is identical to P0171, except it indicates the problem exists on Bank 2 as well.

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