H02S Heater Control Circuit High

Diagnostic conditions 

• Battery positive voltage between 10 V and 16 V
• Engine running

Possible cause of fault 

• Short circuit to B+ in triggering wire
• Oxygen sensor faulty
• DME control module faulty

Affected terminals 

DME control module, connector II, pin 7 and oxygen sensor jack ahead of catalytic converter, bank 1, pin 2