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How to replace the diesel glow plugs on a Mercedes W124

Model: Mercedes Mercedes Various
Part: Spark plugs

This video tutorial will explain how to replace the diesel glow plugs on a Mercedes W124. First, open the bonnet and, using a 10mm socket, remove the fastening elements of the intake pipe support. After removing the fastening bolts, disconnect the intake pipe from the intake manifold and remove it. Using an N.H5 HEX key, unscrew the fastening elements of the engine cover, disconnect the throttle rod from the butterfly valve, and detach the cable clip as shown in the video. Disconnect the flexible hoses and remove the intake manifold, disconnect the wiring connectors for the glow plugs, and finally, unscrew and remove the glow plugs using a torque wrench. At this point, insert the new glow plugs and follow the reverse procedure to reassemble everything.

Updated on 31 August 2026 by ScegliAuto

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