Volkswagen Passat 1995 Official Factory Repair Manual page 1574

Diagnostic Trouble Code (DTC) tables:
SAE-
DTC
P0420 Catalyst System Efficiency
Below Threshold, Bank 1
P0422 Main Catalyst Efficiency
Below Threshold, Bank 1
P0440 Evaporative Emission System
P0441 Evaporative Emission System
Incorrect Purge Flow
P0442 Evaporative Emission System
Leak Detected (small leak)
P0443 Evaporative Emission System
Purge Control Valve Circuit
P0444 Evaporative Emission System
Purge Control Valve Circuit
Open
P0445 Evaporative Emission System
Purge Control Valve Circuit
Shorted
P0458 Evaporative Emission System
Purge Control Valve Circuit
Low
P0459 Evaporative Emission System
Purge Control Valve Circuit
High
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DTC text Corrective action
- Check Oxygen Sensor (O2S) and oxygen
sensor control before Three Way Catalytic
Converter (TWC) Page 24-87
- Check Oxygen Sensor (O2S) and oxygen
sensor control behind Three Way Catalytic
Converter (TWC) Page 24-92
- Check catalytic converter
- Check Evaporative Emission (EVAP) Canister
Purge Regulator Valve -N80-
- Fuel tank ventilation, checking
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ST-67
Page 26-11
Page 20-31
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6/12/2004