What does the Chrysler Grand Voyager trouble code P0420 mean?

1 Answers
RyleeDella
07/29/25 9:41pm
The Chrysler Grand Voyager trouble code P0420 indicates insufficient performance of the three-way catalytic converter. Below are specific details about the three-way catalytic converter: 1. Causes of three-way catalytic converter failure: Abnormal engine management system control, high-temperature deactivation, chemical poisoning, surface carbon buildup and blockage, oxygen sensor failure, mechanical damage. 2. Steps to take when encountering trouble code P0420: Check for exhaust pipe leaks, inspect the oxygen sensor, use an OBDII scanner to test values with the engine running to verify correct data collection, clean the three-way catalytic converter by adding 5 liters of pure banana oil at half-tank fuel level and driving 250km.
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