P0651 Mercedes-Benz Sensor Reference Voltage B Circuit Fault

P0651 Mercedes-Benz Sensor Reference Voltage B Circuit Fault

Possible causes
– Faulty Engine Control Module (ECM)
– ECM harness is open or shorted
– ECM circuit poor electrical connection
– Shorted sensor on 5 volt circuit
What about the obd code?
The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is higher or lower than expected
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
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