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.
Friday, May 9th, 2014 AT 9:45 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,052 POSTS
What code are you getting and is it the same as what you got before the sensor was replaced?
Was this
answer
helpful?
Yes
No
Friday, May 9th, 2014 AT 9:52 AM
Tiny
BUSTER55555
  • MEMBER
  • 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.
Was this
answer
helpful?
Yes
No
Friday, May 9th, 2014 AT 10:09 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,052 POSTS
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?
Was this
answer
helpful?
Yes
No
Friday, May 9th, 2014 AT 10:47 AM
Tiny
BUSTER55555
  • MEMBER
  • 3 POSTS
No, I have not. I'll do that. Thanks for the help.
Was this
answer
helpful?
Yes
No
Friday, May 9th, 2014 AT 10:51 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,052 POSTS
Let me know what you find.

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

Joe
Was this
answer
helpful?
Yes
No
Friday, May 9th, 2014 AT 7:02 PM

Please login or register to post a reply.

Related Check Engine Light Content

Is it Safe to Drive Check Engine Light?
VIDEO
Is it Safe to Drive Check Engine Light?
In­struc­tional re­pair video
Check Engine Light
GUIDE
Check Engine Light
Why is my check en­gine or ser­vice en­gine soon turned on? In this guide we talk about what this is as­so­ci­ated with this no­to­ri­ous light, what it is used for and what you...
VIEW MORE