O2 Sensor or something else?

[LawDisco]

The service engine light was on and I had the codes checked. The codes indicated the passenger side O2 sensor needed replaced so I replaced it and cleared the codes.

The light returned the next day and the codes now read both front O2 sensors. Since I already replaced the passenger side sensor does this indicate another problem? What would cause the light to remain on after replacing the sensor?

Should I go ahead and replace the drivers side or is the issue not likely a sensor at all since the codes indicate a bad passenger sensor even after replacement?

The kid at advance suggested taking it to a stealership so I slapped his chubby face and told him not to say such things.

 

[carlosz]

Get it diagnosed properly, if throw parts at it you will regret it very quicky.
failure of the o2 sensor is the end result of a down hill effect. you have other issues at the motor where the end result is a sensor with a failure code because it has reached working limits.
what the issue may be I dont know, there is a number of things contributing to the final factor.

 

[helievacpilot]

Two things. Always replace O2 sensors in pairs. Upstream and downstream. Second, don't go low-ball on the sensors. For whatever reason, D2's seem to be sensitive to the cheapies.
- Bill

 

[LawDisco]

Thanks for both of your responses. Replacing them in pairs is a good idea.

Bill, the sensor I bought was a Bosch product that came in at around $80.
Is there a better option out there?

Carlosz, should I take it to a dealership to be diagnosed properly? If the problem could be worse than an O2 sensor, yet the codes only suggest a failed sensor, it seems like I need some higher knowledge.

 

[agthird]

it should say right or left bank but I would replace them in pairs...also make sure you are not getting oil or coolant on the connectors it will short them out fast...and the bosch are good ones...

 

[BBQ Rig]

Had almost the same thing happen to my 00 D2! Code said right bank downstream was bad. Truck had high miles and I had no idea when they were last replaced, so I replaced both upstream and the "defective" downstream. Engine light has come back on and codes say the three that were replaced are now bad and the truck is running richer than ever! I don't get it!!