03 Jetta Code: 0420
#1
10-09-2012, 10:12 AM
03 Jetta Code: 0420
I have a 03 Jetta 2.0 9close to 140,000 miles) and the check engine light came on a while ago. It gave me a code of 420 indicating "Catalyst System Efficiency Below Threshold (Bank 1)". That is the only code being read although my car overheats if driven over 15 minutes and the car does not blow heat if turned on. Only time car blows heat is when it over heats. Also there has been a noticable loss of power in the car when driving. There is coolant in the car and there are no leaks at all. What could/should be done to fix this problem???
#2
10-09-2012, 07:06 PM
Welcome to the forum. 
VAG Error Code: 16804
VAG Error Code: 16804
EOBD II Error Code: P0420
Fault Location:
Catalytic Converter System, Bank 1 - Efficiency Below Threshold
Catalytic Converter System, Bank 1 - Efficiency Below Threshold
Possible Cause:
Leakage in Intake and/or Exhaust System.
Catalyst faulty.
Oxygen Sensor(s) faulty.
Oxygen Sensor(s) Control faulty.
Leakage in Intake and/or Exhaust System.
Catalyst faulty.
Oxygen Sensor(s) faulty.
Oxygen Sensor(s) Control faulty.
Possible Solutions:
Check Intake and Exhaust System for Leaks.
Check Catalyst.
Check Oxygen Sensor(s).
Check Oxygen Sensor(s) Control.
Perform Oxygen Sensor(s) Aging Check.
Check Intake and Exhaust System for Leaks.
Check Catalyst.
Check Oxygen Sensor(s).
Check Oxygen Sensor(s) Control.
Perform Oxygen Sensor(s) Aging Check.
Special Notes:
For 1.8T's experiencing this fault code, this thread may be useful: Aftermarket DP/Cat -DTC - Cat efficiency below threshold - Who has this DTC and wich DP/Cat
For 1.8T's experiencing this fault code, this thread may be useful: Aftermarket DP/Cat -DTC - Cat efficiency below threshold - Who has this DTC and wich DP/Cat
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