2000 S40 Check engine light
I recently replaced the oxygen sensors in my s40 but, the check engine light is still on. I took it to Autozone to have them reset the light, but they said that was illegal and refused to do it. They did tell me that the light would go out after about three days when the computer had run through its diagnostics. Is that a true statement?
Sometimes, unless there is an other issue. You might want to get your mechanic to scan the car.
The readiness monitors will reset themselves after 10-15 good trips, meaning no error detected, or 150 miles. This is possibly a true statement but time will tell. Give it a few days.
Disconnect the battery for a few minutes to clear the codes. It will take a few good drive cycles for the computer to ready itself again. If there is still an o2 sensor problem however, you will most likely see the check engine light come back on after a few miles of driving. -Chris-
Looking for a Used S40 in your area?
CarGurus has 1,236 nationwide S40 listings starting at $1,700.
Search Volvo S40 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Volvo S40 Experts