Question 1

What are the symptoms of a failing Alternators & Charging on a NCV3 Sprinter?

Accepted Answer

Extended cranking when cold, smooth starting once warm White smoke and a rough, misfiring idle for the first minute after a cold start Glow plug lamp flashing, or a stored fault that clears in summer and returns in winter Battery drain from repeated long cranks

Question 2

Which fault codes point to this NCV3 Sprinter repair?

Accepted Answer

P0671–P0675: Glow plug circuit, cylinders 1 through 5. P0380 / P0381: Glow plug/heater circuit A malfunction or indicator circuit. P0562: System voltage low — often surfaces alongside hard-start complaints. Confirm with a scan tool before ordering — codes narrow the system, not the exact part.

Question 3

Does Alternator – 6421540802 (VALEO) | Mercedes Sprinter 3.0L Diesel Charging System fit my Sprinter?

Accepted Answer

Listed for NCV3 Sprinter, OM642 engine. Listed for the NCV3 generation (2007–2018). Part numbers can differ within a generation by year and engine code — send the VIN and we'll confirm the exact number. This part is listed for the OM642 engine code. Confirm the code on your engine data plate or build sheet matches before ordering.

Alternator – 6421540802 (VALEO) | Mercedes Sprinter 3.0L Diesel Charging System

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