Mercedes-Benz 2.0T Ignition Coil Replacement | M274 M270

Is your Mercedes-Benz 2.0T engine misfiring, shaking at idle or showing a check engine light? A failed ignition coil is one of the most common causes. Learn how to replace it yourself.

Video

Signs of a Bad Ignition Coil

• Rough idle, shaking or stumbling, especially under load
• Loss of power and poor fuel economy
• Check engine light, flashing if the misfire is severe
• Misfire codes P0300 (random) or P0301 to P0304 (the last digit is the cylinder number)

Confirm the Coil Before You Buy

1. Read the codes to find which cylinder is misfiring.
2. Swap the coil from that cylinder with a coil from another cylinder.
3. Clear the codes and drive. If the misfire moves to the new cylinder, the coil is bad. If it stays put, check the spark plug, injector or compression on that cylinder.

A scan tool such as the YOUCANIC UCAN-II Pro shows live misfire counts per cylinder on supported models, so you can see the result of the swap test right away without waiting for the light.

What you will need

• T25 Torx Bit 3/8″ Drive
• 3/8″ Ratchet wrench
• Gloves
• Flathead screwdriver

Procedure

1. Park the Mercedes-Benz on level ground, set the parking brake, and let the engine cool down.
2. Pull the hood release under the dashboard to open the hood.
3. Remove the engine cover by lifting it.
4. Remove the T-25 Torx bolts that secure the ignition coil to the engine. Each ignition coil has two bolts.
5. Disconnect the electrical connector. Use a flathead screwdriver to unlock the tab on the connector. Then press and pull the connector away.
6. If the ignition coil comes with the boot, pull up the coil and the boot together to remove them from the spark plugs. If you are not replacing the boot, use a flathead screwdriver to pry out the spark plug boot from the ignition coil.
7. Pull the ignition coil upwards.
8. Remove the ignition coil.
9. Install the new ignition coil and torque the Torx screws to 10Nm.

Applications

Mercedes-Benz

• 2015“present W205 C160
• 2012“2013 W204 C180
• 2013“2016 W212 E180
• 2013“2016 W212 E200 Natural Gas Drive
• 2013“2016 W212 E200
• 2013“2016 X204 GLK200
• 2014“2018 W205 C200
• 2015“present R172 SLK200
• 2016“present W213 E200
• 2013“2016 W212 E250
• 2013“2016 X204 GLK250
• 2014“2018 W205 C250
• 2015“2018 W205 C350e
• 2016“present W213 E250
• 2016“present W213 E350e
• 2015“2018 W205 C300
• 2015“2018 W213 E300
• 2015“present X253 GLC300
• 2015“present R172 SLK300

Infiniti

• 2016-present CV37 Q60
• 2018-present Y51 Q70
• 2015-present V37 Q50

Check Engine Still On

If the check engine light is still on after you have replaced the ignition coil, you will need to clear the stored codes on your Mercedes-Benz. The YOUCANIC Full System Scanner can read and clear fault codes through every control module of your Mercedes-Benz, if it is supported.

Frequently Asked Questions

How do I know which ignition coil is bad on my Mercedes?

Read the misfire code. P0301 to P0304 tells you the cylinder. Swap that coil with a neighbor and see if the misfire moves.

Should I replace all four coils on an M274?

Not required, but if the car has high mileage and the coils are original, replacing all four can prevent repeat misfires.

Should I replace the spark plugs with the coils?

If the plugs are near their service interval, yes. A worn plug puts extra load on the coil.

Check these troubleshooting and repair guides for more help on your Mercedes-Benz.

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