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Can't Cure O2 Code


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Freddie21
Novice

Mar 5, 2023, 9:30 AM

Post #1 of 7 (891 views)
Can't Cure O2 Code Sign In

1997 Chevy Venture, 3.5L, 253000 miles.

Sorry, I don't have the code #'s but may not need them.

First code shows trailing O2 sensor heater open. I replaced it and the code changed to trailing sensor out of tolerance. Replaced it again with a Bosch and same code. Engine runs little rich, but smooth. Catalytic converter bad? Thanks,


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 5, 2023, 10:29 AM

Post #2 of 7 (886 views)
Re: Can't Cure O2 Code Sign In

Code numbers dictate very specific situations so we need that code number to help you.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 5, 2023, 12:13 PM

Post #3 of 7 (875 views)
Re: Can't Cure O2 Code Sign In

A '97 w 250,000 miles this is open book IMO.
Check wires to those other work along the way may be damaged, burnt thru insulation or holding them out of harm's way failed.
The more you delay fixing that the more likely it will take out converter if not damaged now at least not operational?

Tom



Freddie21
Novice

Mar 5, 2023, 12:47 PM

Post #4 of 7 (857 views)
Re: Can't Cure O2 Code Sign In

Thanks Guys, I will try and get the codes. All wires have been checked for good.


Sidom
Veteran / Moderator
Sidom profile image

Mar 5, 2023, 7:29 PM

Post #5 of 7 (838 views)
Re: Can't Cure O2 Code Sign In

As already stated get those codes pulled. Also grab a test light and check all the fuses in both boxes. If the fuse for the O2 heater is blown, that Will set a code


Freddie21
Novice

Mar 6, 2023, 5:11 PM

Post #6 of 7 (816 views)
Re: Can't Cure O2 Code Sign In

Thanks again, will have to get to car to get codes later.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 6, 2023, 5:46 PM

Post #7 of 7 (814 views)
Re: Can't Cure O2 Code Sign In

If you get me the codes numbers I can tell you which fuses to check.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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