Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

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

2

This step determines if the condition is present.

3

When DTCs P0133 and P0153 are set at the same time, fuel contamination is likely.

4

An exhaust leak 6-12 inches (152-304 mm) away from the HO2S can cause a DTC to set.

5

This step tests whether a good ground circuit is available.

6

This step tests the integrity of the HO2S high signal circuit to the PCM.

7

This step tests the integrity of the HO2S high signal circuit to the PCM.

8

Certain RTV silicone gasket materials release vapors that can contaminate the HO2S. Silicone in the fuel can also cause silicone contamination. If the sensors appear contaminated by silicone, and if all the silicone sealant is a non-silicone base, advise the customer to try a different fuel company. A missing fuel filler restrictor indicates that the customer may have used leaded fuel.