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Hi hope you can help. I just bought a 2003 Celica GT car runs great, when I purchased car the engine light was already on the guy I bought it from told me it was the oxygen censor of course I had my mechanic hook up the computer and it did give the code that the down flow oxygen censor needed changing, I had it changed but not original Toyota, anyhow a few days later the engine light came back I had mechanic check it the computer gave code that the catalytic converter was the fault so what he did was a hard reset along with changing the down flow oxygen censor again in the case there was a default with it, 4 days later engine light back on, I have tried a injector cleaner no help, I have taken out the injectors and looked at them they look good. My mechanic does not think it is the catalytic but maybe the other oxygen censor up flow.But what he suggest first is a proper injection cleaning and is it possible to blow air through the catalytic to clean it out? he did say it gets warmer then it should but besides all this car runs A OK!.. What do you suggest not much money at the time what is my best move? thanks in advance Lorna.

Answers from the Automotive Experts

Amanda J. Pierce, MBA Lorna, All these steps are wise preliminary things to check over, if at the end you still have your check engine light due to the catalytic converter your result may be in replacing.

Gail Dunn, Owner at Women's Automotive Connection Lorna If you are getting a faulty catalytic converter code, I would suggest you change it out. An aftermarket is cheaper than the OE. You may spend more money doing all of the suggested processes than just replacing the converter.

Gelina Aquilina, Service Advisor / Mechanic at Sensors are always cheaper then replacing exhaust components. I'd start there, but then if it's the cats - you don't have much choice. The check engine light isn't usually wrong. Next time, DO NOT BUY A CAR WITH A CHECK ENGINE LIGHT ON! I don't know what state you're in, but here in California, the seller is responsible for getting the car to pass smog BEFORE selling & a car with a check engine light on is an automatic fail!

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