Mercedes Sprinter Crankshaft Position Sensor – AB Elektronik | NCV3 3.0L OM642 | #6429050000 (2007–2018)

A failed crankshaft position sensor on a Sprinter OM642 removes the ECU's primary timing reference — without crankshaft position data, the engine cannot fire injectors in sequence, the ignition system loses synchronization, and the van will not start or will immediately stall. This is the AB Elektronik crankshaft position sensor for NCV3 Sprinters equipped with the 3.0L OM642 diesel engine, a direct replacement that restores the crankshaft speed and position signal the entire engine management system depends on.

What This Part Does

The crankshaft position sensor is a Hall-effect or variable reluctance sensor that reads the teeth of the crankshaft reluctor ring to generate a precisely timed pulse train. The ECU uses this signal to determine crankshaft angular position and rotational speed in real time — data that is fundamental to every injection event, turbo control calculation, and engine protection strategy. The cam position sensors use the crank signal as their reference: without it, cam/crank correlation is impossible and the engine cannot operate. On the OM642, the crank sensor is located at the engine block near the crankshaft pulley and reads a toothed wheel on the crankshaft. When the sensor fails, the engine either won't start, stalls immediately after starting, or produces an intermittent no-start that worsens until the sensor is replaced.

Common Symptoms of a Failing Crankshaft Position Sensor

• No-start with no other electrical faults confirmed — no crank signal to the ECU
• Engine that starts briefly then stalls immediately as the signal drops out
• Intermittent no-start that progresses in frequency before becoming permanent
• Check engine light with crankshaft position sensor fault codes
• Engine management shutdown during operation from lost crank signal

When to Replace

Replace when confirmed faulty by scan tool with active crank sensor fault codes, or when a no-start condition is confirmed with no crank pulse on a scope or scan tool.

NCV3 OM642 Specific — VIN Verification Required

This sensor is for NCV3 Sprinters equipped with the 3.0L OM642 diesel engine. Always verify your engine code and VIN before ordering. Contact us and we'll confirm fitment before you buy.

Fitment

• 2007–2018 Mercedes-Benz Sprinter 2500 / 3500 – 3.0L OM642 (NCV3/W906)
• 2007–2009 Dodge Sprinter 2500 / 3500 – 3.0L OM642 (NCV3)
• 2007–2018 Freightliner Sprinter 2500 / 3500 – 3.0L OM642 (NCV3)

Part Numbers

• Mercedes OEM: 6429050000 / A6429050000 / 642-905-00-00
• Manufacturer: AB Elektronik — 9444190
• SKU: 6429050000