P0422 Code - Main Catalyst Efficiency Below Threshold Bank 1

What Does P0422 Mean?

The PCM has detected a catalyst efficiency that is below the normal operating threshold for a specific engine bank. The PCM utilizes exhaust composition and temperature data from the oxygen sensors to calculate what degree of catalyst efficiency is required. If this level is not detected, then the code will be stored and the service engine light will be illuminated. “Bank 1” indicates that the condition causing the code to be stored is located in the catalytic converter for engine bank number one. Engine bank one is typically the bank of the engine where the number one cylinder is located. See the manufacturer’s service manual (or equivalent) for the location of the number one cylinder.

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What are the common causes of P0422 ?

• Faulty IMRC actuator relay (if equipped)
• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
• Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

How do you troubleshoot P0422 ?

Some common repairs for the P0422 trouble code include:

• Replacement of the catalytic converter
• Replacement of oxygen sensors
• New wiring or electrical connectors
• Fixed engine leaks
• Replacement of the mass air flow sensor
• Replacement of the manifold air pressure sensor
• Replacement of the fuel pressure regulator
• Replacement of the coolant temperature sensor

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