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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1076 (Engine Controls Diagnosis - 8.1L (DTC P0175 To P2610)) >> Diagnosis >> DTC P0420 or P0430 >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The PCM determines that the oxygen storage capability of the TWC has degraded to less than a calibrated threshold.

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