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Q: i have to replace catylictic

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my check engine light came on and i pulled code and it stated that my catylictic converter was bad but car still runs good no decreases in performance my question is do i have to change catylitic converter right away or can i do a full tune up and wait until i have the money to pay for it what is your recommendations

My car has 125000 miles.
My car has an automatic transmission.

The Check Engine Light for the converter was most likely a code for the rear O2 sensor indicating a fault with the converter. If your car is running okay, then you may not have a bad converter but a bad sensor. You should have the sensor checked by a certified mechanic, such as one from YourMechanic, to see if the catalytic converter or oxygen sensor need to be replaced.

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