There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the r
P0420 Catalyst System Efficiency Below Threshold (Bank 1) P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1) P0422 Main Catalyst Efficiency Below Threshold (Bank 1) P0423 Heated Catalyst Efficiency Below Threshold (Bank 1) P0424 Heated Catalyst Temperature Below Threshold (Bank 1) ...
(AIR) Pump Relay Control Circuit Bank 2 P0420 – Catalyst System Low Efficiency P0421 – Warm Up Catalyst Efficiency Below Threshold (Bank 1) P0422 – Catalyst System Low Efficiency Bank 1 P0423 – Heated Catalyst Efficiency Below Threshold (Bank 1) P0424 – Heated Catalyst Temperature Below...
P0420 Error Description Catalyst System Efficiency Below Threshold (Bank 1) Indicates Bank 1 catalyst system efficiency is below the acceptable threshold Use of leaded fuel Damaged HO2S Malfunctioning ECT High fuel pressure Damaged exhaust manifold Damaged catalytic converter Oil contamination Cylinder misfir...
Catalyst System Efficiency Below Threshold (Bank 1) Warm Up Catalyst Efficiency Below Threshold (Bank 1) Main Catalyst Efficiency Below Threshold (Bank 1) Heated Catalyst Efficiency Below Threshold (Bank 1) Heated Catalyst Temperature Below Threshold (Bank 1) Catalyst Temperature Sensor (Bank 1) ...
Catalyst System Efficiency Below Threshold (Bank 2) P0429 Catalyst Heater Control Circuit (Bank 1) P0428 Catalyst Temperature Sensor High Input (Bank 1 Sensor 1) P0427 Catalyst Temperature Sensor Low Input (Bank 1 Sensor 1) P0426 Catalyst Temperature Sensor Range/Performance (Bank 1 Sensor 1)...
P0456- EVAP Control System Leak Detected Very Small Leak P0102- Mass or Volume Air Flow Circuit Low Input P0446- Multiple Displacement System Rationality Bank 2 P0420- Catalyst System Efficiency Below Threshold Bank 1 P0171- System Too Lean Bank 1 ...
P0456 - EVAP Control System Leak Detected Very Small Leak P0102 - Mass or Volume Air Flow Circuit Low Input P0446 - Multiple Displacement System Rationality Bank 2 P0420 - Catalyst System Efficiency Below Threshold Bank 1 P0171 - System Too Lean Bank 1 P0300 - Cylinder Misfire Detected Rand...
P0420 - Catalyst Efficiency (bank 1) P0430 - Catalyst Efficiency (bank 2) P0440 - General Evap System Failure P0441 - Evap Purge System Performance P0443 - Evap Purge Solenoid Circuit P0452 - Evap Pressure Switch Stuck Closed P0455 - Evap Purge System Large Leak P0456 - Evap Purge Syste...
P0420 Catalyst System Efficiency Below Threshold (Bank 1) P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1) P0422 Main Catalyst Efficiency Below Threshold (Bank 1) P0423 Heated Catalyst Efficiency Below Threshold (Bank 1) P0424 Heated Catalyst Temperature Below Threshold (Bank 1) ...