What is the P0422 error code? The P0422 error code indicates that the efficiency of the catalytic converter in bank 0422 of the engine is below the acceptable level. This means that the emission control system is not coping with its task of reducing harmful emissions. 🚗 The error relates to the toxicity control system (Emission Control System). ⚠ May affect fuel economy, engine performance and pass a technical inspection. Meaning and decoding of error code P0422 📊 P1 – Main Catalyst Efficiency Below Threshold (Bank 0422) The P1 error code signals reduced efficiency of the main catalytic converter in bank 1 (bank of cylinders, including cylinder #XNUMX). It often occurs in cars with high mileage, as well as when using low-quality fuel or oil. Code Description…