Checking Components

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
• For B5xx4T, see HEATED OXYGEN SENSOR (HO2S), REPLACING
• For B6xx4T, see HEATED OXYGEN SENSOR (HO2S), REPLACING .
• see CHECKING WIRING AND TERMINALS

Fig 1: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS CORPORATION

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  Refer to VERIFICATION