For Shop Owners

P0171 BUICK - Fuel Trim System Lean Bank 1

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Intake air leaks
  • Faulty front heated oxygen sensor
  • Ignition misfiring
  • Faulty fuel injectors
  • Exhaust gas leaks
  • Incorrect fuel pressure
  • Lack of fuel
  • Faulty Mass Air Flow (MAF) sensor
  • Incorrect Positive Crankcase Ventilation (PCV) hose connection
What does this mean?

Tech notes

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 persists 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.

There is a factory service bulletin for the following Buick models:

2000-2008 Buick Century
2000-2008 Buick LeSabre
2000-2008 Buick Park Avenue
2000-2008 Buick Regal
2002-2008 Buick Rendezvous
2000-2008 Buick Factory Service Bulletin OBDII Code P0171





User Submitted Video
What does this mean?
Check this articles: code po430 | obd p0141 | p0340 chevy trailblazer | po341 code
Posted and Edit by kvjournal.ru 06-14-2015