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Hi Im David, thanks for visiting the site. what was the code that was obtained when you took it to have scanned?
Ok. thats the bank 1 sensor 2 (rear)oxygen sensor reporting whats coming out of the catalytic converter to the computer. replacing the sensor is a 50/50 shot. you will need to determine if the cat is clogged/bad. to do that requires a back pressure test or a temperature comparison test.
yes it would be. it doesnt matter how many miles are on your vehicle. you dont want to start throwing parts at your car until the root of the problem is found. have the tests done.
checking in to see how its going