P0423 – Heated catalytic converter, bank 1 -efficiency below threshold
| Code | Fault Location | Probable Cause |
|---|---|---|
| P0423 | Heated catalytic converter, bank 1 -efficiency below threshold (Buy Part On Amazon) | Catalytic converter, wiring, HO2S 2 |
We recommend Torque Pro
Help Us Help You
We have not gotten around to publishing a technical guide specifically for P0423 – Heated catalytic converter, bank 1 -efficiency below threshold yet.
To escalate the priority of this guide in our production queue, please let us know the specifics of your vehicle (make, model, year, miles, and engine) and make a $9.99 donation via the payment button below. We will follow up immediately with additional questions as needed and email you a detailed guide for your vehicle.
Please help support us and let us help you.