How to carry out replacement: Glow Plugs E 250 D 2.5 (124.126, 124.129) Mercedes E Class W124
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Change Mercedes E Class W124 E 280 2.8 (124.029) Glow Plugs yourself – manuals and video tutorials

How to change glow plugs on Mercedes W124 – replacement guide

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When to replace the Glow Plugs on your MERCEDES-BENZ E-CLASS
Recommended replacement interval for the part category Glow plug : 30000 km
Important!
This replacement procedure can be used for:
MERCEDES-BENZ C-Class Saloon (W202) C 250 D (202.125), MERCEDES-BENZ E-Class T-modell (S124) E 250 TD (124.186) … View more

The steps may slightly vary depending on the car design.

How to change glow plugs on MERCEDES W124 [TUTORIAL AUTODOC]

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Published on: 31/03/2023
7K views
All the parts you need to replace – Glow Plugs for E-Class Saloon (W124) and other MERCEDES-BENZ models
Alternative products
How to change Glow plug on Mercedes E Class W124 E 250 D 2.5 (124.126, 124.129) – step-by-step instructions for straightforward car repair Glow plug
Tools
Replacement: glow plugs – Mercedes W124. Tools you need:
All-purpose cleaning spray
Electronic spray
High-temperature anti-seize lubricant
Torque wrench
Combination spanner #8
Combination spanner #10
Drive socket # 8
Drive socket # 10
HEX bit No.H5
Torx bit T45
Spark plug socket # 12
Ratchet wrench
Crow bar
Needle nose pliers
Microfibre towel
Fender cover
Buy tools
Replacement: glow plugs – Mercedes W124. Tip from AUTODOC experts:
  • The replacement procedure is identical for all glow plugs.
  • All work should be done with the engine stopped.
Replacement: glow plugs – Mercedes W124. Take the following steps:
  1. Step 1
    How to change Glow Plugs on Mercedes E Class W124 1993 - free PDF and video manuals
    Open the hood.
  2. Step 2
    How to replace MERCEDES-BENZ E-Class Saloon (W124) E 250 D 2.5 (124.126, 124.129) 1994 Glow Plugs - step-by-step manuals and video guides
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
  3. Step 3
    Mercedes E Class W124 E 300 D 3.0 (124.131) 1995 Glow Plugs replacement: free workshop manuals
    Unscrew the fasteners of the inlet pipe bracket. Use a drive socket #10. Use a ratchet wrench.
  4. Step 4
    Changing Glow Plugs on MERCEDES-BENZ E-Class Saloon (W124) E 220 2.2 (124.022) 1996 by yourself
    Remove the fastening bolts.
  5. Step 5
    How to remove MERCEDES-BENZ E-CLASS E 200 D 2.0 (124.120) 1997 Glow Plugs - online easy-to-follow instructions
    Unscrew the fasteners connecting the inlet pipe to the intake manifold. Use HEX No.H5. Use a ratchet wrench.
  6. Step 6
    How to replace Glow Plugs on MERCEDES-BENZ E-Class Saloon (W124) 1998: download PDF manuals and video instructions
    Remove the fastening bolts.
  7. Step 7
    How hard is it to do yourself: Glow Plugs replacement on Mercedes E Class W124 E 250 2.5 Turbo Diesel (124.128) 1999 - download illustrated guide
    Remove the inlet pipe. Use a crowbar.
  8. Step 8
    Need to know how to renew Glow Plugs on MERCEDES-BENZ E-CLASS 2000? This free workshop manual will help you to do it yourself
    Cover the intake channels of the engine with a microfibre cloth to prevent dust and dirt from getting inside.
  9. Step 9
    Changing of Glow Plugs on Mercedes E Class W124 1993 won't be an issue if you follow this illustrated step-by-step guide
    Unscrew the engine cover fasteners. Use HEX No.H5. Use a ratchet wrench.
  10. Step 10
    MERCEDES-BENZ E-CLASS E 280 2.8 (124.029) Glow Plugs replacement: online guides and video tutorials
    Remove the fastening bolts.
  11. Step 11
    Replacing Glow Plugs on Mercedes E Class W124 1995 E 250 D 2.5 (124.126, 124.129) by yourself
    Detach the accelerator rod from the throttle valve.
  12. Step 12
    E-Class Saloon (W124) E 200 D 2.0 (124.120) 1996 Glow Plugs DIY replacement workshop manual
    Remove the engine cover.
  13. Step 13
    How to change Glow Plugs on MERCEDES-BENZ E-Class Saloon (W124) 1997 - tips and tricks
    Unscrew the accelerator rod fastener. Use a combination spanner #10. Use a drive socket #8. Use a ratchet wrench.
  14. Step 14
    Step-by-step recommendations for DIY replacement Mercedes E Class W124 1998 E 200 D 2.0 (124.120) Glow Plugs
    Detach the accelerator cable retainer.
  15. Step 15
    DIY replacement of Glow Plugs on MERCEDES-BENZ E-Class Saloon (W124) E 200 2.0 (124.019) 1999 is not an issue anymore with our step-by-step tutorial
    Unscrew the accelerator bracket fasteners. Use a drive socket #10. Use a ratchet wrench.
  16. Step 16
    How to change Glow Plugs on Mercedes E Class W124 1993 - free PDF and video manuals
    Remove the fastening bolts.
  17. Step 17
    How to replace MERCEDES-BENZ E-Class Saloon (W124) E 250 D 2.5 (124.126, 124.129) 1994 Glow Plugs - step-by-step manuals and video guides
    Move the accelerator mechanism aside.
  18. Step 18
    Mercedes E Class W124 E 300 D 3.0 (124.131) 1995 Glow Plugs replacement: free workshop manuals
    Detach the vacuum hoses from the intake manifold.
  19. Step 19
    Changing Glow Plugs on MERCEDES-BENZ E-Class Saloon (W124) E 220 2.2 (124.022) 1996 by yourself
    Clean the intake manifold fasteners. Use all-purpose cleaning spray.
  20. Step 20
    How to remove MERCEDES-BENZ E-CLASS E 200 D 2.0 (124.120) 1997 Glow Plugs - online easy-to-follow instructions
    Unscrew the intake manifold fasteners. Use Torx T45. Use a ratchet wrench.
  21. Step 21
    Remove the fastening bolts.
    Step 22
    How to replace Glow Plugs on MERCEDES-BENZ E-Class Saloon (W124) 1998: download PDF manuals and video instructions
    Unscrew the fasteners of the intake manifold bracket. Use a drive socket #10. Use a ratchet wrench.
  22. Step 23
    Remove the fastening bolts.
    Step 24
    How hard is it to do yourself: Glow Plugs replacement on Mercedes E Class W124 E 250 2.5 Turbo Diesel (124.128) 1999 - download illustrated guide
    Remove the intake manifold.
  23. Step 25
    Need to know how to renew Glow Plugs on MERCEDES-BENZ E-CLASS 2000? This free workshop manual will help you to do it yourself
    Cover the intake manifold passages with a microfibre towel to prevent dust and dirt from getting inside.
  24. Step 26
    Changing of Glow Plugs on Mercedes E Class W124 1993 won't be an issue if you follow this illustrated step-by-step guide
    Clean the intake manifold mounting seats. Use all-purpose cleaning spray.
  25. Step 27
    MERCEDES-BENZ E-CLASS E 280 2.8 (124.029) Glow Plugs replacement: online guides and video tutorials
    Detach the glow plug wiring connectors. Use needle nose pliers.
  26. Step 28
    Replacing Glow Plugs on Mercedes E Class W124 1995 E 250 D 2.5 (124.126, 124.129) by yourself
    Unscrew the fastener of the wiring harness bracket and move the harness aside. Use a drive socket #10. Use a ratchet wrench.
  27. Step 29
    Clean dirt, dust and debris from inside the spark plug wells. Use all-purpose cleaning spray.
    Step 30
    E-Class Saloon (W124) E 200 D 2.0 (124.120) 1996 Glow Plugs DIY replacement workshop manual
    Unscrew the glow plugs. Use the spark plug socket #12. Use a torque wrench.
    Replacement: glow plugs – Mercedes W124. AUTODOC recommends:
    The glow plugs can get stuck over time and break apart when removed.Use a torque wrench to loosen the parts to avoid exceeding the breakaway torque specified by the car manufacturer.If you have reached the breakaway torque but the glow plugs still won't unscrew, you need to consult a professional: breakage of the parts can result in costly engine repairs.
  28. Step 31
    How to change Glow Plugs on MERCEDES-BENZ E-Class Saloon (W124) 1997 - tips and tricks
    Remove the glow plugs.
  29. Step 32
    Step-by-step recommendations for DIY replacement Mercedes E Class W124 1998 E 200 D 2.0 (124.120) Glow Plugs
    Treat the glow plugs. Use high-temperature ceramic grease.
  30. Step 33
    DIY replacement of Glow Plugs on MERCEDES-BENZ E-Class Saloon (W124) E 200 2.0 (124.019) 1999 is not an issue anymore with our step-by-step tutorial
    Install new glow plugs to their mounting seats.
  31. Step 34
    How to change Glow Plugs on Mercedes E Class W124 1993 - free PDF and video manuals
    Tighten the glow plugs. Use the spark plug socket #12. Use a torque wrench. Tighten it to 20 Nm torque.
    AUTODOC recommends:
    Don't use excessive force when tightening the spark plugs. Overtightening can damage the threaded connection. 
  32. Step 35
    How to replace MERCEDES-BENZ E-Class Saloon (W124) E 250 D 2.5 (124.126, 124.129) 1994 Glow Plugs - step-by-step manuals and video guides
    Treat the glow plug connectors. Use dielectric grease.
  33. Step 36
    Mercedes E Class W124 E 300 D 3.0 (124.131) 1995 Glow Plugs replacement: free workshop manuals
    Install the wiring harness bracket and screw in the fastener. Use a drive socket #10. Use a ratchet wrench.
  34. Step 37
    Changing Glow Plugs on MERCEDES-BENZ E-Class Saloon (W124) E 220 2.2 (124.022) 1996 by yourself
    Attach the glow plug wiring connectors.
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