Actually knowing the code can help.
A filthy car salesman filtering your diagnostic information mightn't show you the best route.
How may miles are on your '02? How pristine does it look? I can't imagine any dealer wanting to take an '02 in on a trade-in.
What's the vintage, mileage and appearance of the car he's steering you toward?
I replaced the front O2 sensor of my '02 2.4 NA with a Denso 234-9019. "Everybody" warned against buying any cheap sensor for a Volvo. "Universals" are completely out of the question.
The circuitry associated with these sensors is said to be unforgiving in our cars.
The vast majority of posters here suggested buying only volvo sensors.
I selected the Denso because Denso makes O2 sensors for Volvo. The old one was of Volvo brand and p/n (9497292) AND bore the Denso logo too.
There was no problem over 41 months and 39,000 miles at which time I sold the car.
Were I in your situation I'd get the code(s) read by a VIDA or PPC reader. Then take it from there.
I do not want to get ahead of the task here but I'd go with the Denso units.
Unless the cat has been burnt up by raw fuel I'd bet it's still good. Kira
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