jeep liberty codes po422 Possible causes - Warm Up Three Way Catalytic converter deterioration or malfunction - Exhaust system leaks - Loose front or rear HO2Ss - Faulty front heater O2 sensor - O2 ...
...P0422 Main Catalyst Efficiency Below Threshold Called volkswagen and the guy said that its unlikely that the coolant caused the transmission to go into limp mode, and said bring it in and give them ...
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