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1997 Pontiac Bonneville check engine light

Tiny
JOHN PERELLI
  • MEMBER
  • 1997 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 91,000 MILES
Code p0171 lean bank #1 check engine light keeps coming on I erase codes with obdd2 checker and code comes back within 10 miles ive already spent $85.00 on oxygen sensor help thanks john
Wednesday, February 4th, 2009 AT 6:20 PM

2 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, The code doesn't tell you what to replace, just that there' s a problem. Maybe the system is running lean, fuel, vacuum leak.

Did you check the 02 sensor circuits? If it reads lean, you try to make it read rich, if it does, it may be ok.
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Thursday, February 5th, 2009 AT 7:27 AM
Tiny
CRZYDRVR
  • MEMBER
  • 432 POSTS
He's on the right track. I would like to add that even a weak fuel pump could do this. If you were to take this to a shop they should be able to look at the fuel trims to help make a better determination.
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Wednesday, February 18th, 2009 AT 2:58 AM

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