2005 Lotus Elise Logo
Posted on Aug 18, 2009
Answered by a Fixya Expert

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Keep getting a P0171. Cleaned MAF sensor. Everything seems to be in spec.

1 Answer

Vincent G

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  • Master 2,363 Answers
  • Posted on Aug 31, 2009
Vincent G
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Joined: Jul 09, 2009
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Any leak in the EGR system and problem with lazy O2 sensor will trigger P0171.

It will take time to troubleshoot this problem.

Check and clean the carbon built up on EGR valve and EGR air passage tube.

Replace the EGR base gasket.


O2 should be inspected or change if it's getting close to 36,000 miles.

Get Denso O2 sensor. It's a better by design.....compare to OEM and BOSCH O2.


Please post result on the comment page.

I will follow up.

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Why does my 2011 Equinox keep stalling?

Where did you come up with p0506 too rich ? That's not what that code is about .
DTC P0506: Idle Speed Low . Your best bet take it to a qualified repair shop before you replace more parts it doesn't need .
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2001 Buick la sabre Code p0171 and p0102 I have replaced every thing but the Maf and erg

did you clear all codes after fitting everything the read for codes again

try cleaning the plug in contacts of the maf
and cleaning the maf itself
Mass Air Flow (MAF) Circuit Low Input
https://www.obd-codes.com/p0102

A code P0102 may mean that one or more of the following has
happened:
The MAF may be disconnected, or a wiring connection may be bad The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF). The MAF sensor may be faulty The vehicle computer may be faulty (very rare)

if you replaced.02 sensor.it should not throw a pO171code
https://www.obd-codes.com/p0171


egr valve ...can be tested ...even cleaned

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P0171, Could this be the o2 sensor in bank 1, and can someone help me identifiy the part number for the o2 sensor in question?

Definition of Diagnostic Trouble Code P0171 Category: Powertrain Definition: System Too Lean Bank 1Note: This definition of P0171 is applied to all manufacturers

passenger o2 sensor,replace it
0helpful
1answer

What does emission test codes P0171 and P0174 stand for?

Most common cause is a dirty MAF (Mass Air Flow) Sensor..It can be cleaned with a Radio Shack product called DeOxit...Remove MAF, Delicate so be careful, spray with No-Touch DeOxit , replace...


  1. Remove the MAF sensor plate and MAF sensor from the outlet side of the air cleaner...


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I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

1helpful
1answer

I keep getting a p0171 and p0175 codes from the scanner (auto x-ray)(meaning i'm lean in bank 1 and too rich in bank 2). fuel injector cleaner didn't help really help. so should i replace the upstream O2...

p0171, p0175 = system too lean (usually related to MAF Sensor) this means that the Air Flow Sensor is telling the computer that much less air is entering the engine than actually is. but first check for vacuum leaks in hoses and also pcv hose. the maf sensor may just need cleaned. any auto parts store will have maf sensor spray, follow directions on can. or you can use electrical spray also. as for the 02 sensors its possible. check or clean maf sensor first.
3helpful
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Code p1130 p0171

P0171- mens the MAF sensor is dirty and needs cleaned. You can get MAF cleaner at your local auto parts store. The MAF is located in the air intake just after the air filter
P1130- is more than likely a result of the previous code. It is in regard to the feul/air mixture ratio. A dirty MAF can cause this code.
Also, if you are using an aftermarket oiled air filter, it would be the cause of the P0171 code.
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