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post #1 of 11 (permalink) Old 09-07-2012, 02:34 PM Thread Starter
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Exclamation Check Engine Light

Hey guys, I have had a check engine light for quite some time and decided to purchase a code reader and the code it is pulling is P0135 02 sensor heater circuit malfunction (Bank 1 Sensor 1). Does this mean that the o2 sensor itself needs replaced and how hard is this to do?
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post #2 of 11 (permalink) Old 09-07-2012, 03:38 PM
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Just had the same code like 3 weeks ago. You will need to replace the o2 sensor, and do yourself a favour and replace with a dealer one.
I had to use a torch to heat the manifold over and over whenever the o2 sensor started getting tight as I backed it out. Took me about 30 mins from start to finish although it felt like 30 hrs (engine was hot, i was frustrated, etc). Some people will tell you just stick some pb blaster to her and wa la quick wrenching and you're done, but I wouldnt expect it

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post #3 of 11 (permalink) Old 09-07-2012, 04:06 PM
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That means the heating element has burnt out in the first HO2 sensor. Only cure is to change it.

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post #4 of 11 (permalink) Old 09-07-2012, 06:49 PM Thread Starter
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So is it worth paying someone for the labor to do it, or is it something that you guys would do by yourself, not really worried so much about it being time consuming. Also where is this o2 sensor found and when buying the o2 sensor are they universal as far as on the cobalt?
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post #5 of 11 (permalink) Old 09-07-2012, 07:14 PM
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People on here have had bad experience with universal O2's. Best to buy GM or ACDelco. They are not the same first HO2 and downstream. The one giving you the problem is the pre-cat HO2. It goes here...



If you don't have the tools, best to get it done at a shop but if your handy and your pipe is not to rusty and you have a HO2 socket go for it.

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post #6 of 11 (permalink) Old 09-09-2012, 06:48 AM
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Just to clarify mine was in the manifold itself and not on the downpipe

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post #7 of 11 (permalink) Old 09-09-2012, 09:20 AM
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Oops! Your right I overlooked the year of his car.

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post #8 of 11 (permalink) Old 09-09-2012, 03:49 PM Thread Starter
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oh by the way money man miss read yours thought you meant it was better to pay to have it done instead of you saying replace it with dealer one makes sense now.
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post #9 of 11 (permalink) Old 09-09-2012, 06:22 PM
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yea you can do it yourself but use a dealership o2 sensor or you'll have problems. I went through 3 rear o2's in 2 weeks before I got my dealer one and no more problems for 5.5months now

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post #10 of 11 (permalink) Old 09-09-2012, 06:52 PM
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Yellowcobalt05 maybe you should clear the code and see if it comes back before you go all out, because sometimes HO2s will not reach operating temperature in time for an unspecified reason (like carbon build-up) but might still be good. Clear the code if it comes back then take appropriate measures.

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