Hello all,

I have cel on and the code is 0509 the same o2 sensor that I replaced 7 month ago.


I have reset the ecu but on the highway when I force it to pass other cars on a slope for instance , the light comes back on.

I am not sure changing that o2 sensor will resolve the problem.
Please help.


Thank You

 

Has this happened to anybody before?
I will appreciate your response.

 

Did you install o2 yourself?..if not, at the dealer? or independent mechanic?..if so, take it back..you can also test the 02 sensor by using a multimeter .try connecting and disconnecting it, just a few suggestions.

 

I replaced that by myself. When I backprobe the sensor the voltage is 0.1-0.7.

So I am wondering if the sensore gives highvoltage only some odd times, or is it something else?

 

Check Your PM.