Mercedes-Benz C300 Spark Plug Replacement Costs

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Spark Plug Replacement Service

How much does a Spark Plug Replacement cost?

On average, the cost for a Mercedes-Benz C300 Spark Plug Replacement is $246 with $106 for parts and $140 for labor. Prices may vary depending on your location.

Car	Service	Estimate	Shop/Dealer Price
2013 Mercedes-Benz C300V6-3.5L	Service typeSpark Plug Replacement	Estimate$826.92	Shop/Dealer Price$936.30 - $1221.92
2009 Mercedes-Benz C300V6-3.0L	Service typeSpark Plug Replacement	Estimate$739.36	Shop/Dealer Price$864.28 - $1226.05
2021 Mercedes-Benz C300L4-2.0L Turbo	Service typeSpark Plug Replacement	Estimate$575.18	Shop/Dealer Price$649.70 - $864.89
2018 Mercedes-Benz C300L4-2.0L Turbo	Service typeSpark Plug Replacement	Estimate$475.18	Shop/Dealer Price$531.63 - $693.43
2016 Mercedes-Benz C300L4-2.0L Turbo	Service typeSpark Plug Replacement	Estimate$533.58	Shop/Dealer Price$599.50 - $768.42
2014 Mercedes-Benz C300V6-3.5L	Service typeSpark Plug Replacement	Estimate$980.29	Shop/Dealer Price$1126.36 - $1540.97
2017 Mercedes-Benz C300L4-2.0L Turbo	Service typeSpark Plug Replacement	Estimate$358.39	Shop/Dealer Price$413.36 - $574.07
2010 Mercedes-Benz C300V6-3.0L	Service typeSpark Plug Replacement	Estimate$739.36	Shop/Dealer Price$864.36 - $1226.18

Show example Mercedes-Benz C300 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.

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Travis

10 years of experience

160 reviews

Travis

10 years of experience

by Amanda Bennett

C300 2008 - Spark Plugs - Matthews, NC

There is nothing a person with car issues love more than an HONEST MECHANIC. Travis serviced my C300 Mercedes by replacing my sparks plugs. Initially the service was suggested to be roughly $400. Well, Travis was not only on time and ready to get the job done, but he notified me that additional parts and labor wasn’t needed as part of the service which reduced the bill by $100. I understand that driving foreign can get quite expensive. However we all know, in many cases mechanics will not inform you of this and will still charge you, if not more. I appreciate his time, attentiveness, and honest service. He completed the job very quickly as well. I can already tell the difference in the performance of the vehicle. Thanks Travis, you have my stamp of approval and Im looking forward to having you service my car again in the future.

Vadym

4 years of experience

43 reviews

Vadym

4 years of experience

by Mario Lopez

C300 2013 - Spark Plugs - Denver, CO

Great work

Mike

25 years of experience

79 reviews

Mike

25 years of experience

by David McGrann

C300 2017 - Check Engine Light is on - Livonia, MI

Mike diagnosed the problem quickly and was completely honest. I fully recommend him and Your Mechanic.

Christopher

20 years of experience

2 reviews

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Christopher

20 years of experience

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by Pranit Flora

C300 2014 - Fuel Filter - Stamford, CT

Very professional and courteous

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