Question about 2005 Lotus Elise

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

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Vincent G

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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.

Posted on Aug 31, 2009

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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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Oct 20, 2016 | Cars & Trucks

1 Answer

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

Jul 05, 2015 | Cars & Trucks

1 Answer

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

Mar 13, 2015 | 2002 Ford Windstar

1 Answer

I have a 2001 tacoma 4.3 v6 with cold air intake i keep getting a p0171 code i can reset and drive about 5-8 miles and back on any solutions


Hi there:

Basically this means that an oxygen sensor in bank 1 has 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. The P0171 is one of the more common trouble codes.


This code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1. If something is not right and the PCM cannot maintain the 14.7:1 ratio, but rather there is too much air, it triggers this code. 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 cracked vacuum or PCV line/connection
Faulty or stuck open PCV valve
Failed or faulty oxygen sensor (bank 1, sensor 1)
Sticking/plugged or failed fuel injector
Low fuel pressure (possible plugged/dirty fuel filter!)
Exhaust leak between engine and first oxygen sensor
Possible Solutions
A lot of times, cleaning the MAF sensor and finding/fixing vacuum leaks fix the problem. If you're on a tight budget, start there, but that may not be the fix for certain. So, possible solutions include:


Clean the MAF sensor. 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/repair as required
Inspect all hoses and connections in the air intake system
Inspect and/or test the intake manifold gaskets for leakage
Check for a dirty fuel filter and proper fuel pressure
Ideally you'll want to monitor short and long term fuel trims using an advanced scan tool
If you have access, you may want to run a smoke test


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jul 06, 2012 | Toyota Cars & Trucks

1 Answer

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.

Jul 29, 2010 | Chrysler Concorde Cars & Trucks

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.

Nov 22, 2009 | 1999 Chevrolet S-10 Pickup

1 Answer

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.

May 16, 2009 | 2001 Toyota Tacoma

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