What would cause an o2 sensor to go out within a week of putting it in. I get good readings then at some point. normaly during a data log, it starts getting smaller and smaller deviations from 100mv to 800 then 200 to 700 then flatlines at @ 500 to 600 then stays there.

Has anyone else seen this, what do I do , and it doesnt flag the o2 casue it still reading 600-700 which is makeing the right bank really lean out.

HELP

 

What brand of O2? Have you done anything to your car lately? I would say something is either fouling the sensor end or the wiring or something is not right.

 

bosch o2s and it seems to go out when I am logging and tuning. I bypassed the factory harness, atleast to where the part of the wires that is close to the exhaust if it were damaged in some way. but same thing.

 

bosch might be the problem, i could never get them to last longer then a few months in my car

 

Ac delco and no other. The oem sensors have been the best with no close 2nd. I got them for $40 EACH ON eBAY.

 

i have had lots of problems with them also, get oem

 

Is your car using any oil?