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How to repair odb2 code p0171 - 1997 Oldsmobile 88

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P0171 means that an oxygen sensor in bank 1 detected a lean condition meaning there is to much oxygen in the exhaust. Bank 1 is the front side of the engine. There's other things that can trigger that p0171 code like the MAF (Mass Air Flow) Sensor which could be dirty or faulty. There could be a vacuum leak downstream of the MAF sensor.

Before you try to replace that MAF sensor, take it off and clean it which a Brake cleaner. Try not to damage the sensor and make sure to clean it dry before putting it back in. The MAF sensor is located on the throttle body. It looks like this (They are small and expensive, try cleaning it first before buying a brand new one, not a remade [the cheaper one]):
how to repair odb2 code p0171 - jcharger16_1.jpg

Inspect all vacuum and PCV hoses, replace if they look bad. Check for a dirty fuel filter and proper fuel pressure then it should be back up and running good.

Posted on Feb 18, 2011

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parkerjohn
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SOURCE: ODB2 code P0171

change bank 1 sensor 1 o2 sensor

Posted on Sep 06, 2011

  • 1146 Answers

SOURCE: odb2 reading codes p0171, p0174, p0300. running

Hi:

  • 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
  • Posted on Dec 11, 2009

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    Hi:
  • 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
  • Dec 11, 2009 | 2002 GMC Sierra 1500

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