The check engine light on my daughter's 2000 S40 is lit. The dealership said it is likely an oxygen sensor. The car has also been stalling intermittently at traffic lights or when generally slowing to a stop.
Assuming the problem is the O2 sensors, how many are there? I just looked under the hood and see what look like 2 before the Catalytic converter and I didn't see any after it (I have not put the car in the air yet for an undercarriage inspection).
I plan to replace them all. How difficult a task is this?
Thanks!
Gary
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