P0421 Code - Warm Up Catalyst Efficiency Below Threshold Bank 1

What Does P0421 Mean?

Code P0421 is triggered when the Bank 1 Warm Up Catalytic Converter's emissions reducing efficiency has fallen below the minimum allowable threshold.

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What are the common causes of P0421 ?

Some potential causes of the P0421 code may include:

• A faulty catalytic converter (most likely cause unless other codes are stored as well)
• A faulty oxygen sensor
• Damaged oxygen sensor circuitry
• A faulty powertrain control module

How do you troubleshoot P0421 ?

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0421 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.



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