Thread: P0135 Diag Code

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  1. #1 P0135 Diag Code 
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    2004 GTP has this o2 sensor code. Bank1, sensor1 02 Heater circuit.
    Is it time to replace that one ? Or is there any other fix for the heater ?
    Better yet which one is that ? Upstream in front of engine ?
    Thanks,,,
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  2. #2 Re: P0135 Diag Code 
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    That's the front one, could be the heater circuit could be the wiring. look there first.
    An engine is an engine no matter the size.... I think Dr. Seuss said that... or maybe it was Big Weld....
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  3. #3 Re: P0135 Diag Code 
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    Quote Originally Posted by J57ltr View Post
    That's the front one, could be the heater circuit could be the wiring. look there first.
    OK, so in front manifold ,,,, not near the firewall ?
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  4. #4 Re: P0135 Diag Code 
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    No there are only 2 one in front of the cat and one and after 1&2. Check the wiring then ohm out the heater circuit on the O2.
    An engine is an engine no matter the size.... I think Dr. Seuss said that... or maybe it was Big Weld....
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  5. #5 Re: P0135 Diag Code 
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    Quote Originally Posted by J57ltr View Post
    No there are only 2 one in front of the cat and one and after 1&2. Check the wiring then ohm out the heater circuit on the O2.
    Thanks j57ltr !
    If it is just the heater circuit and the O2 sensor is still functioning after it heats up from engine heat, is it even worth changing the O2 sensor ?
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  6. #6 Re: P0135 Diag Code 
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    You will need to, to pass emissions. Look into the wiring first too since you could have a break in the line or even a fuse blown.

    Jeff
    An engine is an engine no matter the size.... I think Dr. Seuss said that... or maybe it was Big Weld....
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  7. #7 Re: P0135 Diag Code 
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    its a dead o2, change it, buy one on line at rockauto, get a delco, buy a o2 socket and take the old one out and pop the new one in.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  8. #8 Re: P0135 Diag Code 
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    Yeah. Thanks guys. Will order an oem one [ Delco ] from Rock Auto .... Took a look at the wiring today. Nothing abnormal.
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