BMW B38 B48 Crankshaft Position Sensor Crank Angle Sensor – Original Used Part

Diagnosis and Common Symptoms

The crankshaft position sensor is the primary timing reference for the DME (Engine Control Unit). On the B38 and B48 modular engines, a failing sensor typically manifests as an intermittent signal loss once the engine reaches operating temperature. Common fault codes include P0335 or BMW-specific codes related to crankshaft signal plausibility. Symptoms include prolonged cranking before the engine starts, sudden stalling while idling or decelerating, and a "Drivetrain Malfunction" warning on the iDrive screen. In severe cases, the engine will crank but fail to fire because the DME cannot synchronize fuel injection and ignition timing without a valid crank angle signal.

Introduction

As a technician, I recommend Genuine BMW sensors over aftermarket alternatives because the B-series engines are highly sensitive to signal frequency and voltage drift. This Genuine Used unit has been salvaged from a low-mileage donor vehicle and subjected to a multi-point inspection to ensure the magnetic tip and electrical connector are free from degradation. By choosing a tested Genuine part, you ensure factory-spec timing accuracy without the high cost of a brand-new component.

Product Details

• Brand: Genuine BMW
• Model Compatibility: BMW 1, 2, 3, 4, 5, 7 Series, X1, X2, X3, X4, X5 (B38 1.5L and B48 2.0L Engines)
• Part Name: Crankshaft Position Sensor / Crank Angle Sensor
• Condition: Genuine Used (Tested Working)
• Notes: Inspected for pin corrosion and thermal housing stress. This is a 3-pin Hall-effect sensor designed for high-precision timing.