Mercedes-Benz SLC300 Spark Plug Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(155)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(155)

Spark Plug Replacement Service

How much does a Spark Plug Replacement cost?

On average, the cost for a Mercedes-Benz SLC300 Spark Plug Replacement is $277 with $106 for parts and $171 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2017 Mercedes-Benz SLC300L4-2.0L TurboService typeSpark Plug ReplacementEstimate$419.38Shop/Dealer Price$490.48 - $663.29
2018 Mercedes-Benz SLC300L4-2.0L TurboService typeSpark Plug ReplacementEstimate$383.38Shop/Dealer Price$454.52 - $627.34
Show example Mercedes-Benz SLC300 Spark Plug Replacement prices

What are spark plugs and how do they work?

Spark plugs are one of the key components of your vehicle’s ignition system. They ignite gasoline and air inside of your engine. This gives your engine the power to propel you down the road. The spark plug takes high voltage electricity from the ignition coil and creates a spark at just right moment during the engine’s combustion cycle. This gives the engine the best mix of power, fuel economy and low emissions. However, the electrode at the end of the spark plug eventually wears out and can cause performance issues.

Spark plugs-MATROX-1

When should you replace spark plugs?

Replacement should follow the vehicle maintenance schedule. This will be listed in the vehicle’s owner’s manual. Some cars require regular replacement at 30k, 60k or 100k miles. It is possible in some cases that a spark plug might fail before the service schedule, but it’s not typically common.

Avoiding spark plug replacement can cause:

  • Difficulty starting your car.
  • Check engine light for a misfire code.
  • Flashing check engine light during acceleration for misfire, this can cause engine damage.
  • Reduced fuel economy and/or power.
  • Rough idle and/or unexplained engine vibration.
  • Failed State emission testing.

Even if only one spark plug is found to be faulty, they should always be replaced in sets. Most engines will require 4,6, or 8 spark plugs.

How do mechanics replace spark plugs?

Spark plugs are threaded into the engine’s cylinder head(s). Most cars have one plug per cylinder, so a four-cylinder engine will have four plugs, a six-cylinder engine will have six plugs, and so forth. The mechanic will:

  • Have the correct spark plugs on hand for your vehicle
  • Pull any diagnostic trouble codes that may be related to worn spark plugs.
  • Remove the original spark plugs and look at removed spark plugs for any clues indicating engine mis-operation exists; such as oil burning, excessively rich mixture, pre-ignition damage etc. Inform owner of any found unusual conditions.
  • Install new plugs using a torque wrench.
  • Finally, a road test of the vehicle to confirm normal operation.

Is it safe to drive with worn spark plugs?

Yes, but spark plugs that are worn enough to cause engine-misfiring have the potential to cause engine damage and overheating of the catalytic converter. Regardless of the age of the plugs, or mileage, if the engine misfires or runs poorly, the plugs should be inspected for defects. Generally, spark plug failure will not keep the engine from running, but in cases of extreme wear, you may experience a limitation in the speed at which you can drive the car. If the maintenance schedule says the plugs should be replaced, it is best to do so promptly.

When having spark plugs replaced keep in mind:

  • High-speed driving may accelerate spark plug wear. Consider earlier than required inspection and tune-up if you operate the car in severe conditions.
  • Plugs should always be promptly replaced per the manufacturer maintenance schedule even if they appear to be working perfectly.
  • If your vehicle is equipped with spark plug wires (as opposed to a coil-on-plug system), the wires should be replaced at the same time. This may increase the cost of your repair.
  • It is possible that when doing a spark plug replacement, your vehicle may also need additional parts like ignition coils, this will add to the repair cost.
  • Some engines require that the intake manifold be removed while replacing spark plugs. This may increase the parts and labor cost for the repair.
  • Leaking valve cover gaskets, which have let oil get in contact with the spark plugs, coils or wires, may be the cause of ignition system issues. Valve cover gaskets will need to be replaced in addition to the spark plugs, wires or coils. This will add to the repair cost.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(155)

Rating Summary
152
1
1
0
1
152
1
1
0
1

Mazyar

8 years of experience
464 reviews
Mazyar
8 years of experience
Mercedes-Benz SLC300 L4-2.0L Turbo - Brake Pads Replacement (Front) - Atlanta, Georgia
Could not have been more pleased with the great customer experience provided by Mayzar. He was early on a day that was very nasty due to weather. Kept me updated and made sure I understood everything he did. Looking forward to my next maintenance experience with Your Mechanic team.

Charles

17 years of experience
176 reviews
Charles
17 years of experience
Mercedes-Benz C350 V6-3.5L - Spark Plugs - Rockville, Maryland
Echoing others, he's very friendly and would explain things in plain English and would answer any question. Like others, I'm planning to book this gentleman again in future for any follow-ups.

Rodric

14 years of experience
414 reviews
Rodric
14 years of experience
Mercedes-Benz C250 L4-1.8L Turbo - Spark Plugs - Atlanta, Georgia
Great experience, even learned more about my vehicle. Thank you!

Chet

41 years of experience
491 reviews
Chet
41 years of experience
Mercedes-Benz C250 L4-1.8L Turbo - Spark Plugs - Chula Vista, California
Great mechanic. Really knows his stuff. I also appreciate the feedback that was given to keep my car in tip top shape! Thank you!

Excellent Rating

(155)

Rating Summary
152
1
1
0
1
152
1
1
0
1
Number of Mercedes-Benz Spark Plug Replacement services completed
1705+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

A Buyer’s Guide to the 2012 Mercedes-Benz R-Class
This This non-minivan, non-SUV, non-station wagon is nothing if not a class unto itself. Mercedes classifies it as a crossover but it reps more like a combination of all of the above. Its precise identity is really immaterial however, as...
Symptoms of a Bad or Failing Oil Filter Housing Gasket
Common signs include the Engine Oil Light coming on, oil dripping from the filter, and lower than normal oil pressure.
How to Diagnose a No-Spark or Loss of Power Condition on a Modern Car
Misfires caused by a loss of power condition on a car can be tricky to diagnose, but are necessary to fix to avoid further damage and costly repairs.

There is a VERY loud roaring noise when i take my car above 60 on the highway coming from the soft top hood.

Hello Hannah. Sometimes on a soft top Jeep (specifically Wranglers), the excessive noise is caused by a weather strip on the outside of the doors that has worn out. It's also possible that the interior 'weather strip' on the top...

emergency brake broke

If the cable has broken, to obtain a repair quote, please click on "Get a Quote" at YourMechanic's emergency brake cable replacement service page (https://www.yourmechanic.com/services/emergency-parking-brake-cable-replacement). As long as the parking break lever is not damaged and the remainder of the...

My parents car won’t start but the radio and everything works and the battery and steering wheel light is on

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com