Checking components

Check the connectors for the heated oxygen sensors (HO2S). Check for contact resistance. Check for oxidation.

Check the exhaust system for air leakage.

HINT: If the above fault-tracing does not remedy the fault, try replacing the heated oxygen sensors (HO2S), as the diagnostic trouble code (DTC) can also be stored by a damaged front/rear heated oxygen sensor (HO2S). 

Remedy as necessary.

Other information 

• See Checking for air leakage in the exhaust system
• See Heated oxygen sensor (HO2S), replacing
• See Contents

Fig 1: Identifying VCT2000 Diagnostic Tool

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Verification