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Error code reads engine running lean - 2001 Ford Escort ZX2

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Need to adjust the valve settings.

Posted on Mar 12, 2009

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Im getting P0171 code- lean .


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1 Answer

Engine code reads to lean at idle


Vacuum leak,dirty MAF sensor,Dirty fuel filter.

Jan 17, 2015 | 2006 Hyundai Sonata

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I have a 94 Pontiac grand am2.3. It runs fine in the morning but after work it dies when I push on the breaks. All of my inside lights come on when it dies and it starts back up but dies again when I start...


Does your "Check Engine" light come on, John? I'd hope so. If it does, please have someone with an OBD scanner read your computer error codes.

This sounds for all the world like the engine is running much too lean when warm. The power brakes use vacuum to assist pedal pressure, and that vacuum draws a lot of air from the intake manifold. Normally, that's not enough air to make a difference, but if the engine's already running much too lean it might be enough to cause the symptoms you describe.

Aug 01, 2014 | Cars & Trucks

1 Answer

Code po157


02 sensor circuit low voltage ---answer is copied from obd-codes .com you can visit this site for more information if necessary Usually rear o2 sensor problems won't cause drivability issues since they are an input that measures catalyst efficiency (unlike front o2 sensors). However if you have other codes present, like lean codes or pre-o2 sensor codes, then they may cause drivability problems as well as P0143. The following symptoms may be present: MIL (Malfunction Indicator Lamp) illumination Engine performance issues Engine running rough Engine running rich (only if PCM is trying to add fuel to compensate for low o2 sensor voltage reading) Engine running lean (only if vacuum leak is large enough that PCM can't compensate by adding fuel) Poor idle Causes If you have reason to believe that your engine is running lean, fix that problem first, then clear codes and see if the P0157 code resets. An engine that is running lean could set this code, but usually there will be lean codes (P0171, P0174) present. The following could be causes: Air leaks in exhaust in front of o2 sensor giving false reading Engine running excessively lean O2 sensor connector damaged/corroded O2 sensor signal circuit is shorted to ground O2 sensor ground circuit is open O2 sensor has failed (it may be contaminated with fuel or coolant) PCM has failed

Read more at: http://www.obd-codes.com/p0157
Copyright © OBD-Codes.com

Oct 02, 2013 | 2001 GMC Jimmy

1 Answer

Buick Enclave traction control off, service stabilitrak, engine light on. Codes read Bank 1 & 2 running lean


My 2008 Buick Enclave started giving me a warning that Stabilitrak was off and to Service Brake System. We fixed by adding brake fluid, it has to be full to the top.

Feb 06, 2013 | 2011 Buick Enclave

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I have a 2000 Hyundai Sonata that runs rough when you start it up. I hooked a code reader to it and it said that system was lean on bank 1 and multi misfire and not reading 02 sensor on bank one. I have...


time to get the engine properly scanned, real time not code scanner, then you will have the readings from sensore and actuators, diagnose from there

Dec 14, 2010 | Hyundai Motor 2004 Sonata

1 Answer

Engine codes run on 2004 Freestar


Make sure you have all the vacuum leaks repaired.
Disconnect the battery for two mins,codes my clear.
The codes you got are O2 Sensors,because of the vacuum leak,which leaned out the readings and set the codes.

May 03, 2010 | 2004 Ford Freestar

1 Answer

I just bought a used engine for my 1988 lincoln and its reading history codes of 91, 41, and 34. What are these codes


91 (engine running) heated oxygen sensor indicates system lean, left side
91 ( cont. memory) no heated oxygen sensor switching indicated, left side.
41 (engine running) lean right side.
41(cont. memory) no heated oxygen sensor switch,right side.
34 egr valve pressure transducer/position sensor sonic voltage above closed limit.
(tech. manual Haynes #59010)

Sep 25, 2009 | 1998 Lincoln Town Car

1 Answer

1993 Volvo 940 error code 232


2-3-2* Fuel trim (lambda control) too lean or too rich at idle }If too rich: high fuel press., leaking injector } various driving problems Fuel trim (lambda control) too lean at idle Oxygen sensor

Jun 08, 2009 | 1995 Volvo 940

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