The P0423 trouble code is associated with Heated Catalyst Efficiency Below Threshold (Bank 1), indicating that the heated catalytic converter in Bank 1 is not operating as efficiently as expected.
Heated Catalyst Efficiency Below Threshold (Bank 1)
Code symptoms P0423.
1. Illuminated “Check Engine” or “Service Engine Soon” light on the dashboard.
2. Decreased fuel efficiency.
3. Lack of power during acceleration.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0423.
1. Faulty heated catalytic converter in Bank 1.
2. Oxygen sensor issues.
3. Exhaust leaks.
4. Engine misfire.
5. Problems with the Engine Control Module (ECM).
Code Solutions P0423.
1. Check and, if necessary, replace the heated catalytic converter in Bank 1.
2. Inspect and replace any malfunctioning oxygen sensors.
3. Repair any exhaust leaks in the system.
4. Address any engine misfire issues.