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Home >> Chevrolet >> 2003 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> ENGINE CONTROLS - SELF-DIAGNOSTICS - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline >> Diagnostic Tests >> DTC P0135: Ho2S Heater Circuit - Bank 1, Sensor 1 & DTC P0155: Ho2S Heater Circuit - Bank 2, Sensor 1 >> Test Description

Test Description

The numbers below refer to the step numbers in the diagnostic procedure.

  1. 7

    With no fault present, the test lamp will blink once per second.
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