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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1064 (Engine Controls Diagnosis - 8.1L (DTC P0068 To P0174)) >> Diagnosis >> DTC P0136 or P0156 >> 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.
  1. The PCM detects that the HO2S bank 1 sensor 2 or HO2S bank 2 sensor 2 did not transition below 350 mV and above 709 mV during the passive test.
  2. One of the following tests fail:
    • Lean Intrusive Test
      • The PCM detects that the HO2S bank 1 sensor 2 or HO2S bank 2 sensor 2 is more than 350 mV for 25.4 seconds.
      • The HO2S bank 1 sensor 1 and HO2S bank 2 sensor 1 is less than 300 mV.

        OR

    • Rich Intrusive Test
      • The PCM detects that the HO2S bank 1 sensor 2 or HO2S bank 2 sensor 2 is less than 709 mV for 25.4 seconds.
      • The HO2S bank 1 sensor 1 and HO2S bank 2 sensor 1 is more than 600 mV.
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