P0422 - Main Catalyst Efficiency Below Threshold Bank 1
- Exhaust system leaks
- Loose front or rear HO2Ss
- Faulty front heater O2 sensor
- O2 sensors harness is open or shorted
- O2 sensors poor electrical connection
The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor).
A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.
When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.
P0422 CHRYSLER Catalytic 1/1 Efficiency
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P0422 JEEP Catalytic 1/1 Efficiency
P0422 MERCEDES-BENZ Main Catalyst Efficiency Below Threshold Bank 1
P0422 VOLKSWAGEN Main Catalyst Efficiency Below Threshold Bank 1
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