What would cause this...SES light for left/right bank o2s when i just replaced them..

[Harrison]

Alright....this is frustrating..especially when you may 112$ for 2 stupid o2 sensors... SES light was on for a good while before i replaced them. I got the codes scanned at autozone and i wrote the codes down and looked em up in the haynes manual. i got 3 codes. the codes were for the left and right bank o2 sensors below threshold, and the other was for the post-cat o2 sensor. I ordered an o2 sim for the post-cat sensor and i havnt gotten it yet so i know that should still bring up the SES. Anyhow, i replaced the 2 O2 sensors with new bosch ones. 33 miles later....SES comes back on I get them scanned and it's telling me i have the same 3 codes. I unplugged the battery and pulled the PCM fuses after i put the new sensors in as well to clear the computer. Whats up with this? The O2s are on the pacesetter headers too, not stockers, and the codes first came up after i put the pacesetters on back over the summer. Same $hit...different day...

[Formyla]

Re: What would cause this...SES light for left/right bank o2s when i just replaced them..

I bought a code reader/eraser for my LS1 after I installed headers and sims because it occasionaly throws an O2 code. Some cars are worse about it than others. Not an unusual occurance. I'd clear them again and see if they stay off a while. I hear there is a difference in sensors also. Some are better than others.