FixVault
Home
›
Chevrolet
›
2006
›
HHR LS, Standard
›
Repair and Diagnosis
›
Engine Performance
›
System
›
Engine Controls - 2.2L - DTC P0136 To P0446
›
DTC P0420
›
Repair Procedures
Repair Procedures
IMPORTANT:
A new converter with less than 100 miles on it may set P0420 due to out-gassing of the internal matting. Operating the vehicle at highway speeds for approximately 1 hour may correct the condition.
Catalytic Converter Replacement
Heated Oxygen Sensor Replacement - Position 2
Exhaust Leakage
Restricted Exhaust