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Chevrolet
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2009
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TrailBlazer 4.2 S, RWD
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System & Fuel System - 4.2L - DTC P0366 T0 DTC P2544
›
DTC P0420
›
Repair Procedures
Repair Procedures
NOTE:
A new converter with less than 100 miles on it may set DTC 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 (LL8)
or
Catalytic Converter Replacement (LH6/LS2)
Exhaust Leakage
Heated Oxygen Sensor Replacement - Sensor 2
Restricted Exhaust