P0425 Code - Catalyst Temperature Sensor Circuit Bank 1 Sensor 1

What Does P0425 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 P0425 ?

• Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
• Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
• A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

How do you troubleshoot P0425 ?

Depending on what’s actually causing the P0425 code to be stored, a few different repairs may fix the problem, including:

• Replacing the oxygen sensor and/or catalyst temperature sensor
• Replacing faulty wiring or loose connections in the catalyst temperature sensor circuit
• Replacing a defective or damaged catalyst temperature sensor wiring harness

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