Test Description

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

1. 2
   
   This step determines if the condition is present. This test may take 5 minutes for the diagnostic to run.
2. 3
   
   When DTCs P1134 and P1154 are set at the same time, fuel contamination is likely.
3. 4
   
   An exhaust leak 6-12" (152-304 mm) from the HO2S can cause a DTC to set.
4. 5
   
   This step tests the HO2S for being tight and determines if the connectors and circuits are okay.
5. 6
   
   This step tests the integrity of the HO2S low signal circuit to the PCM.
6. 7
   
   This step tests the integrity of the HO2S high signal circuits to the PCM.
7. 8
   
   Certain gasket materials are made of room-temperature vulcanizing (RTV) silicone release vapors that can contaminate the HO2S. Silicone in the fuel can also cause silicone contamination. If the sensors appear silicone contaminated, 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 may indicate that the customer has used leaded fuel.