However, In most cases, you will most likely notice any symptoms except the check engine light with the P0420 code stored in the engine control unit. In rare cases, you can also notice issues like misfires, higher fuel consumption, or a bad odor smell coming from the exhaust pipe. ![]() The most common symptom of code P0420 is a check engine light on the dashboard. In most cases, a P0420 trouble code is caused by a bad catalytic converter. If the catalyst system efficiency is low, the P0420 code will be triggered. The ECM uses two O2 sensors, one in the front and one in the back of the catalytic converter, to measure efficiency. A faulty air-fuel mixture can damage the catalyst, resulting in a P0420 code. It can either be caused by a faulty catalytic converter or a false alarm from a failed O2 sensor. P0420 indicates that the catalyst efficiency is below the threshold, according to the ECM. ![]() P0420 – Catalyst System Efficiency Below Threshold (Bank 1) What does the P0420 Code Mean? Can I drive with the P0420 code? P0420 Code Definition
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