P0434 Code - Heated Catalyst Temperature Below Threshold Bank 2

What Does P0434 Mean?

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.

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What are the common causes of P0434 ?

• Defective ECU strategies or components will prevent proper regeneration
• The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
• An air leak forward of the DPF will change the sensor readings resulting in the code

How do you troubleshoot P0434 ?

A number of repairs may fix the P0434 code, depending on the underlying condition. These include:

• Replacing a failed catalytic converter
• Replacing a failed oxygen sensor
• Repairing exhaust leaks ahead of the converter
• Repairing or replacing damaged wiring or corroded connections

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