RepairPal is your advocate for car care advice and guidance

Q: Can something cause a catalytic converter to fail? on 2003 Toyota Camry

On RepairPal's catalytic converter page, it says the dealership/shop that says my converter has failed should also find out why it failed b/c the root of the problem is something else. Well, the dealership says this isn't true, there's no way to find out why it failed (unless the car shows a diagnostic code for another failed part), and that early failure (i.e. less than five yrs) is generally due to use of an after-market (i.e. non-Toyota) part or neglect of the vehicle. They said there's nothing else I could do to prevent future failure of the converter. Who's correct?
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
sometimes it can be difficult to figure out why a cat goes bad but most common are contamination either bad fuel,engine running too rich, engine burning oil or antifreeze..
Didn't find what you were looking for?