I have just purchased a 2005 V70. The engine light is on and it codes O2 sensor. The dealer has had it for two months and can't fix the problem. They have even tried replacing the computer. They disconnected the O2 sensor and said here's your car back. Our master mechanic has better things to do than work on a problem that can't be fixed. I did not purchase it from the dealership. Any suggestions would be so appreciated.

 

The first thing to do is post up the actual codes then go from there. By disconnecting your O2 sensor they've guaranteed you'd being getting poor gas mileage ,power and maybe even destroy you CAT.

 

Is this a Volvo dealership doing that? Or some used car dealership?

 

Ok as best as I can tell the tech wrote on the initial paperwork, vehicle will CCEL A3 check engine CINSP. A3 Volvo multi. Vm 315 11-14. They have replaced the MAF tried replacing the ECM didn't work. Replaced frontpressure sensor o2 sensor. Still running rough. All wiring has been checked. We bought it used a Toyota dealer and have been working with Volvo to fix it. It has come to light that the previous owner had problems too. I don't know what these codes mean but they are on the statement too. 05d21, 222w-22010, 19 74w-2030. Sorry if this is confusing I am posting this for my husband and I am a little inept.

 

Yes it is the dealership. We have spoken with headquarters and they can't help us unless we choose to go back to the dealership.

 

The codes you posted don't seem to be anything that I know of.

Most OBD2 codes are P xxxx (xxxx is a number)
A volvo specific code should be ECM-XXXX( xxxx is a number.)

Maybe someone else has an answer.

Did they remove & check the plugs or verify the coil packs are all working?