Well, I don't know what you guys are talking about but I had my battery disconnected for a good ten minutes and it did not reset the CEL. I did have to reset the radio code though :-P

I ordered this cable and software on Ebay from Hong Kong that is supposed to work with '96 OBD2 cars, using a laptop with a serial port. I only have $37 into it, and it seemed perhaps like a more elegant solution than a generic code reader... If it works. I'll report back.

If you live in an area where emmissions testing is done, disconnecting your battery is not reccomended. The engine will have to go through a lengthy drive cycle to pass the test, the state will receive a message that the engine is not ready.

There are some really cheap code readers that only display "pass/fail", others will have run time diagnostics. You want a code reader that says it will clear codes on the front of the box. Considering most dealers want $100 to read codes, investing in a $100 code reader is prudent and very cost effective. So is going to a local autoparts store and borrowing a code reader.

Klaus
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Proud owner of a 220S. If I had more room, I would have more Volvos.

Did you get the same code after the rear O2 sensor was replaced? If yes, I am sure of the cause. My 99 v70 story was after the front O2 sensor replaced, I got CEL the next day. It turned out to be a totally different code. you might want to make sure of that first.

As to reset CEL, my understanding is that disconnecting battery (for 10-15 min) is the way to erase all info from your car computer. using a code reader will not clear up your driving history though CEL is off.