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post #1 of 10 (permalink) Old 01-22-2014, 04:02 PM Thread Starter
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Just Stumbled... Changed O2 Sensor Now T/C Light on

Hey guys, im a new owner on a 2005 chevy cobalt ls sedan automatic 2.2. Light came on this morning for bank 1 sensor 1 o2 sensor. So i changed it and the first time i started up the car it ran like shit, kept stumbling then died. Kept doing that until it threw a code. Scanned it and Got Bank 1 sensor 1 then bank 2 sensor 2 then these 3 codes P0036, P0102, P0443. I was so confused! So i unplugged the o2 sensor and it ran ok, plugged it back in and then the car was fine. But now the Traction control light is on. I scanned it and there are no codes but the transmission shifts hard. Im completely lost on how this can happen. Please someone help!
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post #2 of 10 (permalink) Old 01-22-2014, 04:41 PM
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Might have burnt the TCM fuse.

---------- Post added at 08:41 PM ---------- Previous post was at 08:33 PM ----------

P0443 is not a valid code for a Cobalt. A for cylinder doesn't have a bank 2. As for the 2 other codes they relate to a missing voltage, must be a burnt fuse. Did you do any welding on the car at the same time by any chance?

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post #3 of 10 (permalink) Old 01-22-2014, 05:32 PM Thread Starter
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Might have burnt the TCM fuse.

---------- Post added at 08:41 PM ---------- Previous post was at 08:33 PM ----------

P0443 is not a valid code for a Cobalt. A for cylinder doesn't have a bank 2. As for the 2 other codes they relate to a missing voltage, must be a burnt fuse. Did you do any welding on the car at the same time by any chance?
Nope, just put 4 new snow tires on, changed the o2 and then everything went south. Car was driving perfect before it, only has 51000 miles on it. Where would the TCM fuse be located?
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post #4 of 10 (permalink) Old 01-22-2014, 05:35 PM
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Did you happen to jump your car or someones with yours recently?

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post #5 of 10 (permalink) Old 01-22-2014, 05:51 PM
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Nope, just put 4 new snow tires on, changed the o2 and then everything went south. Car was driving perfect before it, only has 51000 miles on it. Where would the TCM fuse be located?

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post #6 of 10 (permalink) Old 01-22-2014, 06:02 PM Thread Starter
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Did you happen to jump your car or someones with yours recently?
Nope, honestly pulled it in to the shop, put new tires on, changed o2 sensor went to start and then problems started happening. I know i kept seeing codes for mas air flow and purge valve solenoid but i have no clue how that would happen!
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post #7 of 10 (permalink) Old 01-22-2014, 06:05 PM
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This don't make sense to me, these run off of 2 seperate supplies. (purge is B+ (control for purge is +5V) and mass air is +11 from ECM)

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Last edited by Coby7; 01-22-2014 at 06:07 PM.
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post #8 of 10 (permalink) Old 01-22-2014, 06:13 PM Thread Starter
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This don't make sense to me, these run off of 2 seperate supplies. (purge is B+ (control for purge is +5V) and mass air is +11 from ECM)
Thats what i mean! Ive changed a bunch of o2's before and never had problems like this. Ill check the fuse tomorrow and see if its blown, which i hope it is. Plus the CEL came back on as soon as i got home so ill rescan it tomorrow and see whats happening... just so frustrating. Never had any problems with my Honda and its a 232000...
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post #9 of 10 (permalink) Old 01-23-2014, 09:34 AM Thread Starter
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okay so i scanned it today and codes p0102 and p0443 came up. I took out the tcm fuse and it was ok, i rotated it and placed it back in. Started up the car and the t/c light was gone, then the car revved up a bit and it came right back, then the cel came back on. Any ideas??
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post #10 of 10 (permalink) Old 01-23-2014, 10:39 AM
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I think your purge valve is stuck open. You,re sucking through it and you are getting unmetered air from the MAF. You can easily remove the purge valve, it just sits on top right side of motor. You should not be able to blow through it when it is disconnected. I have a new one in my hands at the moment and it closed unless voltage is applied.
DTC P0443: Evaporative Emission (EVAP) Purge Solenoid Control Circuit
DTC P0102: Mass Air Flow (MAF) Sensor Circuit Low Frequency

---------- Post added at 02:39 PM ---------- Previous post was at 02:21 PM ----------

Don't worry about the P0102 code it will go away if iy's your purge solenoid that's the problem.


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