P0437 Code - Catalyst Temperature Sensor Low Input Bank 2 Sensor 1

What Does P0437 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 P0437 ?

• A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
• Faulty IMRC actuator/sensor
• Some aftermarket accessories and performance modifications

How do you troubleshoot P0437 ?

Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

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