2246473 72RB501 BMW E34 E39 Diesel Glow Plug Relay – OEM Used & Tested

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This BMW Diesel Glow Plug Relay is a genuine OEM diesel engine electrical component for the BMW E34 and E39 diesel models. Primary OEM number 2246473 (secondary code 72RB501). It is designed to switch the high current needed by the glow plugs during preheating, so that the diesel engine starts reliably in cold conditions.

Its job is to connect the battery supply to the glow plugs when the engine control or preheating timer requests it. As a switching component it carries a high load, which is why it is a common wear item on older diesel engines. A properly working glow plug relay supports quick glow plug heating, easier cold starts and correct operation of the glow plug system. Because the relay handles high current every time the engine is preheated, its contacts wear over the years, and a tested replacement is a practical way to restore reliable cold-start behavior without the cost of a new part.

Common signs of a faulty unit include no glow plug heating, a glow lamp that stays off or behaves strangely, long cranking when cold, white smoke at start-up, or an audible clicking that is missing or irregular when the ignition is switched on. When the relay contacts are worn or burnt, the glow plug system may deliver weak or no current to the glow plugs, so the engine starts poorly in cold weather.

This is a used original part, removed from a vehicle and tested before sale. Match the exact OEM number 2246473 before ordering. Professional installation is recommended, and testing the glow plugs and wiring at the same time is a good idea where applicable.