- Faulty Oil Level Switch
- Oil Level Switch harness is open or shorted
- Oil Level Switch circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
- Engine Light ON (or Service Engine Soon Warning Light)
B1391 DescriptionThe Powertrain Control Module (PCM) monitors the Oil Level Switch. The PCM sets the OBDII code when the Oil Level Switch is not to factory specifications.
B1391 Information for specific makes
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