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Check engine light on 2001 Z-3 Roadster BMW with codes P0171 and P0174

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Bank 1 and Bank 2 are running too lean.

Posted on Apr 02, 2011

Testimonial: "THANK YOU,WHEN THE LIGHT FIRST STARTED COMING ON....IT WOULD GO OUT WHEN I FILLED THE GAS TANK,BUT NOT ANY MORE.NOW I HAVE SOME IDEAS"

  • brotimj Apr 02, 2011

    that helps but how do i correct this situation

  • Spenser_jon Apr 02, 2011

    fuel pump, regulator, or injector may be going out, or you may have a vacuum leak,

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Posted on Jan 02, 2017

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Im getting P0171 code- lean .


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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,,,,,

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1 Answer

Car runs very well after finding air leak at the air intake tube behind air filter, 2001 BMW Z3 3.0 Roadster with engine light on and codes P0171 and P0174, How do I fix?


The main issue here is that the computer can NOT makes the right mixture of fuel and air. So, you might need to change The Mass air flow sensor! This is one of the sensors that I had to change for 3 BMWs I've owned. Hope this help.
nicholas Akbari

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1 Answer

What are the probable causes of DTCs P0171, P0174, and P0455?


Smoke testing for codes P0171 P0174 - YouTube

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Jan 18, 2011 - Uploaded by realfixesrealfast Smoke testing for codes P0171 P0174 .... I have a 1995 ford mustang gt 5.0 and it keeps having a Fault code 176 pop up. ....Ford Explorer P0174 code intake air leak check engine light by froggy - Duration: 16:11. by froggy ...

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2002 bmw check engine light on, diagnostic trouble codes p0174 and p0171.


Google the Codes
OBD PO171 etc & print a code chart
They are Oxygen Sensors-lean on both banks
They should have been changed at 100,000
miles on all your vehicles.

Aug 03, 2013 | 2002 Mitsubishi Montero

2 Answers

I have a 2001 Jimmy with "Service Engine Soon"


P0171 System too lean bank 1
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Last time you changed your fuel filter?
Look for any vacuum leaks.

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Check engine light with codes P0171 & P0174, hesitation at accelleration 2001 mercury sable.


P0171 & P0174 indicate Lean burning on banks 1 and 2. The most common cause is a dirty or defective MAF (Mass Air Flow) sensor. Other causes are bad fuel filters or a broken vacuum line.

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Error code 01710 car stalls and will not start for a few minutes


Hyundai has P0171 and P0170 codes. What does this mean??...and took it to Autozone to run a check engine light test on it. The codes that came back were P0171 and P0170? The possible problems were system too lean, fuel syst fault, ignition syt fault, en...


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