Mercedes-Benz S450 Spark Plug Replacement Costs

Estimate price near me

Service Location

Customer Ratings

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.

See availability

Customer Ratings

Spark Plug Replacement Service

How much does a Spark Plug Replacement cost?

On average, the cost for a Mercedes-Benz S450 Spark Plug Replacement is $411 with $159 for parts and $252 for labor. Prices may vary depending on your location.

Car	Service	Estimate	Shop/Dealer Price
2019 Mercedes-Benz S450V6-3.0L Turbo	Service typeSpark Plug Replacement	Estimate$796.80	Shop/Dealer Price$911.64 - $1236.72
2020 Mercedes-Benz S450V6-3.0L Turbo	Service typeSpark Plug Replacement	Estimate$716.78	Shop/Dealer Price$826.65 - $1148.00
2011 Mercedes-Benz S450V8-4.7L	Service typeSpark Plug Replacement	Estimate$750.90	Shop/Dealer Price$876.28 - $1244.88
2008 Mercedes-Benz S450V8-4.7L	Service typeSpark Plug Replacement	Estimate$750.90	Shop/Dealer Price$876.28 - $1244.87
2009 Mercedes-Benz S450V8-4.7L	Service typeSpark Plug Replacement	Estimate$750.90	Shop/Dealer Price$878.93 - $1249.52
2010 Mercedes-Benz S450V8-4.7L	Service typeSpark Plug Replacement	Estimate$750.90	Shop/Dealer Price$876.53 - $1245.32
2018 Mercedes-Benz S450V6-3.0L Turbo	Service typeSpark Plug Replacement	Estimate$581.38	Shop/Dealer Price$664.40 - $905.88

Show example Mercedes-Benz S450 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

(177)

Rating Summary

172

2

1

0

2

172

2

1

0

2

SEE REVIEWS NEAR ME

Kenneth

21 years of experience

870 reviews

Request Kenneth

Kenneth

21 years of experience

Request Kenneth

by Mia

Mercedes-Benz S450 V6-3.0L Turbo - Pre-purchase Car Inspection - Los Angeles, California

Kenneth is very friendly and easy to work with.

Ricardo

15 years of experience

339 reviews

Request Ricardo

Ricardo

15 years of experience

Request Ricardo

by Mia

Mercedes-Benz S450 V6-3.0L Turbo - Pre-purchase Car Inspection - Culver City, California

Ricardo is very trustworthy, responsible, on time for the service , and fast reply.

Tinashe

14 years of experience

781 reviews

Request Tinashe

Tinashe

14 years of experience

Request Tinashe

by Justin

Mercedes-Benz S450 V6-3.0L Turbo - Turo Host Inspection - Atlanta, Georgia

Amazing guy and very thorough. Best guy for the job 

Ben

42 years of experience

1589 reviews

Ben

42 years of experience

by Nathan

Mercedes-Benz GL450 V8-4.6L - Spark Plugs - Houston, Texas

While Ben was not on time for the appointment, he was in constant communication and informed me of his delay and progress. He was professional and friendly. I would highly recommend, and in fact I will request Ben for our next service next week.

Excellent Rating

(177)

Rating Summary

172

2

1

0

2

172

2

1

0

2

SEE REVIEWS NEAR ME

Recent articles & questions

10 Best Stores to Buy Auto Parts in Dallas, Texas

Automotive technicians rely on auto parts stores to add and replace car parts. The best auto parts shop in Dallas is AutoZone.

How Much Power Does the AC Draw From the Engine?

Most cars these days come with air conditioning as a standard feature – gone are the days...

How to Obtain an A8 ASE Study Guide and Practice Test

Automotive technician jobs pay more if you’re ASE certified. Get the study guide and practice test to be an A8 Engine Performance Repair Technician.

What do the speedometer and odometer do?

The center gauge cluster on your Nissan Altima is home to some pretty important accessories. You have a range of informational and warning lights, as well as a number of gauges and digital displays. The speedometer and odometer are two...

How do I get the passenger airbag sensor to recognize the passenger?

The passenger airbag sensor determines when there is a person in the passenger seat. When the sensor determines that there is a person I the passenger seat, the passenger airbag will be turned on. However, sometimes the passenger airbag sensor...

Electrical issues with the gauges, interior lights, and rear wiper blade.

Hi there. When it comes to multiple systems and the electrical circuits malfunction, there is a power and ground issue. Check the battery cables and clean them with a tooth brush and baking soda with water. This will clean off...

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 (844) 997-3624 · hi@yourmechanic.com