P0431 Code - Warm Up Catalyst Efficiency Below Threshold Bank 2

What Does P0431 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 2” indicates that the condition causing the code to be stored is located in the catalytic converter for engine bank number two. Engine bank two is typically the bank of the engine which does not contain the number one cylinder. 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 P0431 ?

• Faulty catalytic converter
• A faulty mass air flow or manifold air pressure sensor
• Defective O2 sensor/s
• Burnt, chafed, broken, or disconnected wiring and/or connectors
• Engine exhaust leak

How do you troubleshoot P0431 ?

There are currently two main types of cylinder deactivation used today, depending on the type of engine. P0431 code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.

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