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Home > DIY > SL-Class > R129 (1990-2002) > Mercedes Ignition Coil Pack Replacement – DIY Instructions

Mercedes Ignition Coil Pack Replacement – DIY Instructions

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This guide will help you to replace Mercedes ignition coil. Replacing Mercedes-Benz igntion coils is very easy if you have the right tools. These instructions apply to several Mercedes-Benz cars equipped with V6, V8 and V12 gasoline engines.   

Failed ignition coils will cause engine misfire. The car will run rough and the engine may shake extensively. Check engine light will in most cases turn on.

Replacing Mercedes Ignition Coil Packs is easy. If you plan on replacing only one coil you will need less than 30 minutes. If you are going to replace all ignition coils (6 coils on V6, 8 coils on V8, 12 coils on V12) you will need a couple of hours. 

How to replace spark plug ignition coil on a Mercedes-Benz 

Tools Required

Parts Required

Step by step instructions

  1. Open the hood by pulling the hood release under the dashboard. open the hood of your mercedes benz
  2. Disconnect the negative terminal from the battery. Do not touch ignition coils or spark plug wires when the engine is running. Ignition coils generate very high voltage that can be hazardous and even cause death.Disconnect the battery
  1. Remove the engine cover. It can easily be removed by grabbing the cover on both sides and lifting it up. The engine cover is secured with four tabs, and most models don’t use bolts to hold it in place. Remove engine cover to access mercedes ignition coils
  2. Locate the defective ignition coil. You have three coils on the driver side and three coils on the passenger side on the six cylinder engines. In our case, we have an eight cylinder engine so you will see four coils on each side. Location of Mercedes ignition coil packs
  3. Remove the spark plug wires. For this step, you will need the spark plug wire removal tool that we listed above under tools required. Otherwise, you risk damaging the spark plug wire and the spark plug itself. How to remove the spark plug wire E C S CLK SL CL ML Class
  4. Remove the Torx bolt at the center of the ignition coil pack. Unplug the electrical connector from the coil pack. Note: The clip that holds the connector tight on the ignition coil can break very easily. If yours does break use self locking cable ties  to secure the electrical connector to the ignition coil.  Unplug electrical connector from mercedes igntion coil
  5. Note the position of the spark plug wires. If you look carefully on the ignition coil pack, you will see two letter. They are the there to help you avoid installing the wires incorrectly. They will have letters A and B and you will see the same letters on the engine block. 
    Mercedes ignition coil packs
    Mercedes-Benz ignition coil pack. Notice a and b letters on the top. They need to match with the letters on the engine.
  6. a b marking on the engine / valve coverRemove spark plug wires from the old ignition coil and install on the new ignition coil. Firmly press the spark plug boot into the spark plugs. Connect the electrical connector. Tighten the bolt in the centre of the ignition coil to 8 Nm. Remove spark plug ignition coil from Mercedes
  7. Congratulations! You have successfully replaced one or more coil packs on your Mercedes-Benz.


Frequently Asked Questions

Mercedes Ignition Coil Replacement

How much does it cost to replace Mercedes ignition coils?

Replacing a single (one) spark plug coil on a Mercedes-Benz can cost between $170 and $250 at an auto repair shop. If you replace it yourself, you can spend less than $50. Above we have provided links to sites you can purchase Mercedes-Benz ignition coil packs.

How to erase / reset the check engine light after replacing a defective ignition coil?

As long as there are no other fault codes, the check engine light should turn off on its own typically after three driving cycles. It is recommended that you use an OBD II scanner to clear the ECU fault codes, otherwise they will change from CURRENT status to STORED. If you need help on how to clear the ECU codes, read this article on How to check engine light on a Mercedes-Benz.

How to replace ignition coil pack on Mercedes V12 600?

The instructions are similar to the steps that we provided above. Here is a great video that shows how to replace Mercedes ignition coils on a V12.

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What check engine codes (DTC fault codes) can point to a bad ignition coil?

Applicable Models:

E-Class W210 W211 (E320, E500, E350, E55)

C-Class W202 W203 W204 (C240, C320, C350, C280, C300)

CLK-Class W208 W209 ( CLK320, CLK430, CLK500)

CLS-Class W219 (CLS 500 CLS550 CLS55 AMG)

ML-Class W163 W164 (ML320, ML430, ML350, ML500, ML55 AMG)

S / CL-Class W220 (S420 S430 S500 S55 S600 CL500 CL600)

SLK  R170 R171 (SLK320, SLK32, SLK350, SLK280)

W463, 129, 463, R170, 230, R171 G500 SL500 SL600

Related Part Numbers:

000 158 72 03000158720300015019800001502680
0001502780272906006000015873030001587803
A0001587303A0001587800001587803000 158 78 03

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