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@puppygirlhornypost2@transfem.social @kim@linfan.moe It also just be that the catalytic converter itself is bad.

A lot of cars have two O2 sensors, one before and one after the cat so it can measure the difference before and after.

If you truly believe the engine is completely fine and the issue is just the catalytic converter and a whiny ECU you could always replace the ECU with an aftermarket programmable one.