Car goes from throwing one code, to another, and back to the first?

Post by **Korben15** » Thu Jan 05, 2017 5:17 pm

Ok guys, I need some help here. My car was throwing the P2A03 code for bank 2, sensor 1 oxygen sensor. I had that sensor replaced. Then the code came up for the bank 2, sensor 2. I haven't had it replaced yet. I had the codes scanned again today and it showed the P2A03 code and not the one for bank 2, sensor 2. Anyone else had this problem? Is my computer going bad or what?

Post by **Larz** » Thu Jan 05, 2017 6:02 pm

I can't say why the code would flip back and forth like that. Perhaps one of the more tech-savy members will chime in. I can tell you that when my O2 sensor #1 went tits-up, my service rep sent a driver to fetch one from another dealer. The driver returned with sensor #2 by mistake. My rep told me what happened and the driver was gone to get the proper sensor. I asked that they keep the #2 and get the #1 and just replace both. I reckoned that if #1 died, then #2 can't be far behind. The #1 sensor was covered under warranty and I paid for the #2 sensor.
I suggest you just replace both and save another day of service when the other one dies.

Post by **Costee** » Sat Jan 07, 2017 7:29 am

Korben15 wrote:Ok guys, I need some help here. My car was throwing the P2A03 code for bank 2, sensor 1 oxygen sensor. I had that sensor replaced. Then the code came up for the bank 2, sensor 2. I haven't had it replaced yet. I had the codes scanned again today and it showed the P2A03 code and not the one for bank 2, sensor 2. Anyone else had this problem? Is my computer going bad or what?

P2A03 is a most exasperating code. It's usually a small and undetected leak anywhere before the cat. You might have to bide your time to allow the leak to expand till it's detectable or sometimes the leak is itself covered up by deposits in the exhaust.
Btw, the sensor is strictly termed air/fuel ratio sensor. The sensor 2 (lower stream) is oxygen sensor.

Post by **cruzad3r** » Sat Jan 07, 2017 1:11 pm

LOL "most exasperating code"

i'm getting a P2A00 which is bank 1 sen 1 error - swapping O2 sensor and still getting it. The tech that swapped my engine told me the CAT. Not sure how old is your cat but you might want to check that out.

Post by **Costee** » Sat Jan 07, 2017 2:12 pm

cruzad3r wrote:LOL "most exasperating code"

i'm getting a P2A00 which is bank 1 sen 1 error - swapping O2 sensor and still getting it. The tech that swapped my engine told me the CAT. Not sure how old is your cat but you might want to check that out.

I began to be tormented by the code (the bank 1) after I gutted my cat, even after installing an oem a/f sensor. If the code followed the sensor, then the sensor is probably bad. Was the new sensor oem?

Post by **cruzad3r** » Sat Jan 07, 2017 6:31 pm

yup - oem bosch that i swapped out about few months ago that didn't throw any codes. honestly, i should've asked the tech to swap the left to right side and vice-versa. these are bosch 15667 O2 sensors. i bought a set of used OEM cat from a G35 and was told they were good; unfortunately one one works. anyhoo, i already bought another aftermarket direct fit CAT to see if we can fix this stupid code. stay tune

Car goes from throwing one code, to another, and back to the first?

Car goes from throwing one code, to another, and back to the first?

Re: Car goes from throwing one code, to another, and back to the first?

Re: Car goes from throwing one code, to another, and back to the first?

Re: Car goes from throwing one code, to another, and back to the first?

Re: Car goes from throwing one code, to another, and back to the first?

Re: Car goes from throwing one code, to another, and back to the first?

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