I replaced my whole exhaust system back in May. Soon after that I replaced the o2 by the cat. Six months later I replaced the left front o2 and knock sensors. And couple days ago when the weather got down to single digits my check engine light came on. A quick check of the ecu codes showed the right front o2 was setting it off.

Is this normal?

 

has anyone else experience this?

 

reset your ecu and see if it comes back on

 

thanks soul fly, but i reset it once already and it came back the next day.

my car only has 103000 on it. should it be checked out by a dealer?

 

so replace it then. dont take it to a dealer. just replace it yourself.

 

thanks vsamoylov, replacing it isn't the issue. i guess i just wanted to hear if this is normal to replace all three o2 sensors and the knock sensor within 7 months. what i meant by taking it to the dealer was to see if they could troubleshoot the problem of me having so many problems with all the sensors.

 

atleast now you shouldnt need to replace them since you would have replaced them all so you should be fine fo a while. if another one goes out then its cause for concern but assuming this one is the last one that wasnt replaced before then yuo should be kool after this.

 

thanks mdeezy, i guess i'm just bent out of shape 'cause i didn't factor in spending the extra $350 in sensors when i originally put in the exhaust system.

 

bah who needs sensors? lol jk but you can drive fine with a bad downstream, it does not alter a/f at all.