P0420 is a Diagnostic Trouble Code (DTC) for “Catalytic System Efficiency Below Threshold (Group 1).” Its’s up to the mechanic to diagnose the specific cause for activating this code in your case.
AC Off Due To High Engine Temp? Don’t Panic. Assume an incorrect reading informs the ECU that the engine temperature is too high, or that something goes wrong to cause that reading. Is it safe to drive with the air conditioner turned off due to a high engine temperature? Furthermore, the vehicle will require additional diagnostics
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