Oxygen Sensor - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 11 (permalink) Old 12-05-2012, 11:56 AM Thread Starter
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Oxygen Sensor

So after finally deciding to replace my front oxygen sensor and get rid of the check engine light now i have replaced it and have been experiencing some lunging and the needle on the speedometer will jump but the car will not change speed. Has anyone experienced the same problem or perhaps know what would cause this?
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post #2 of 11 (permalink) Old 12-05-2012, 12:12 PM
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Are you sure you got the correct O2 sensor for your year or using the correct up stream and not down stream sensor?


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post #3 of 11 (permalink) Old 12-05-2012, 12:40 PM Thread Starter
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Yeah it was an ac delco, it was identical to the one i had take out. Would the wrong o2 sensor trigger a check engine light. Actually i bought one before the one i have on currently and took it back because it was throwing error codes
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post #4 of 11 (permalink) Old 12-05-2012, 12:50 PM
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It's possible that it wouldn't unless you put the down stream in the up which is possibly what you did the first time. Call your parts store and make sure the number on the sensor matches what they show in the system that you should have received. That would be my starting point.


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post #5 of 11 (permalink) Old 12-05-2012, 05:00 PM
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also, did you delete the code and disconnect the battery when you did this? i took off my throttle body one day to clean it, put it back on and it did the same thing. disconnected the battery after i cleared the code and it was fine after that. electronics are whack

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post #6 of 11 (permalink) Old 12-06-2012, 12:54 PM Thread Starter
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Yeah check engine light is off now just dealing with the lunging and actually had my car pull something funny when i was starting back up from a stoplight and then the needle going crazy
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post #7 of 11 (permalink) Old 12-09-2012, 07:20 AM Thread Starter
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I'm thinking about getting one of those diy complete fuel system cleaners and seeing if that helps with the problem, because if it was the wrong O2 sensor check engine light would be throwing me codes right?
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post #8 of 11 (permalink) Old 12-09-2012, 07:44 AM
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Yes it would. And the codes would be related to any 02 sensor as well as fuel trims. If you put the wrong 02 sensor in there then your stfts or ltfts would be completely out of whack.

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post #9 of 11 (permalink) Old 12-09-2012, 07:54 AM Thread Starter
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Yeah so it's not throwing me any codes so i might just try that diy complete fuel system cleaner and see if that does the trick, any other suggestions, I'm taking any i can get right now
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post #10 of 11 (permalink) Old 12-09-2012, 08:18 AM
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I'm still stuck on your speedometer needle being eratic, that must be some kind of electrical problem. Did you double check your install to make sure everything was re-connected properly and that none of the wire are chafing. Speedometer needle is controlled by "PCM"(05-06) and "ECM"(07up) which in turn is just interpreting the vehicle speed sensor. HO2 sensors and VSS aren't even on the same supply or ground leads.

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