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2002 Pontiac Grand Prix Service Engine Light

Tiny
BUSTER55555
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 3.8L
  • V6
  • AUTOMATIC
  • 131,000 MILES
I replaced the o2 sensors and catalytic converter on my 02' Pontiac Grand Prix but the service engine soon light comes back on after I drive it around. I'm trying to pass emissions! What else could it be? As soon as I hit the 60 mile mark the light came on again.
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Friday, May 9th, 2014 AT 9:45 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
What code are you getting and is it the same as what you got before the sensor was replaced?
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Friday, May 9th, 2014 AT 9:52 AM
Tiny
BUSTER55555
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  • 3 POSTS
First code was for Cat Bank 1. Second time is was the same code so I had a new converter put it and replaced both sensors. This last time the code is P0420 Bank1.
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Friday, May 9th, 2014 AT 10:09 AM
Tiny
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Since you replaced both sensors and the converter, the problem is either in the wiring to the sensors (need checked while engine is running to see how they respond), in need of a tune up, you are dumping fuel from a stuck or worn injector, or the fuel pressure is too high. Have you pulled the plugs to inspect them?
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Friday, May 9th, 2014 AT 10:47 AM
Tiny
BUSTER55555
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No, I have not. I'll do that. Thanks for the help.
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Friday, May 9th, 2014 AT 10:51 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Let me know what you find.

If I don't hear from you, have a good weekend.

Joe
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Friday, May 9th, 2014 AT 7:02 PM

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