P0391 2012 Ford Fusion Code - Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2

The P0391 code indicates an issue with the Camshaft Position Sensor 'B' Circuit Range/Performance on Bank 2, meaning the sensor is not sending the expected signal to the engine control module (ECM).

Common symptoms include a check engine light, rough idling, poor engine performance, reduced fuel efficiency, or difficulty starting the vehicle.

Potential causes include a faulty camshaft position sensor, damaged wiring or connectors, a timing chain or belt issue, or a malfunctioning ECM.

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the camshaft position sensor and its wiring, and checking for proper timing and alignment of the camshaft and crankshaft.

Yes, a faulty camshaft position sensor is one of the most common reasons for this code, as it disrupts the signal required for proper engine timing.

Driving with this code is not recommended, as it can lead to poor engine performance, potential stalling, or further damage to engine components.

Repairs may include replacing the camshaft position sensor, repairing damaged wiring or connectors, or addressing timing issues with the camshaft or crankshaft.

The camshaft position sensor ‘B’ for Bank 2 is typically located near the engine's rear, on the cylinder head opposite Bank 1.

Yes, a misaligned or stretched timing belt can cause improper timing signals, triggering the P0391 code.

The repair cost varies but typically ranges from $100 to $300, depending on whether you replace the camshaft position sensor or address other issues like wiring or timing alignment.