EXPERT IN AUTO PARTS
25 March 2025 (updated) Table of Contents
In this overview you will find the most important information on spark plugs for Mercedes-Benz, including the cost of replacement and the specifics of the procedure, based on the current 2025 data. You will find information on which spark plug models from leading manufacturers are suitable for the various versions of Mercedes-Benz, the number of plugs required for certain engine types and the cost of replacement depending on the number of cylinders. The most important indicators of spark plug failure and the recommended replacement intervals for various Mercedes-Benz models are also presented.
In 2025, the average cost of replacing spark plugs in a Mercedes-Benz car will be between £40 and £90, depending on the number of engine cylinders and other factors. The table below details the spark plug prices for various Mercedes-Benz models, both per part and for a complete set. Please note that the prices shown do not include installation costs.
| Mercedes-Benz model | Recommended brands | How many spark plugs are in my Mercedes-Benz model? (number of engine cylinders) | Total cost of the set (£) | Price per part (£) |
|---|---|---|---|---|
| A-Class | Bosch | 4 | £40 – £60 | £10 – £15 |
| B-Class | NGK | 4 | £40 – £60 | £10 – £15 |
| C-Class | Denso | 4 | £40 – £60 | £10 – £15 |
| C-Class W204 | Champion | 4 | £40 – £60 | £10 – £15 |
| C-Class W205 | Beru | 4 | £40 – £60 | £10 – £15 |
| E-Class | Bosch | 6 | £60 – £90 | £10 – £15 |
| A-180 | NGK | 4 | £40 – £60 | £10 – £15 |
| C-180 | Denso | 4 | £40 – £60 | £10 – £15 |
| C-200 | Champion | 4 | £40 – £60 | £10 – £15 |
| W203 | Beru | 4 | £40 – £60 | £10 – £15 |
| W211 | Bosch | 6 | £60 – £90 | £10 – £15 |
| W212 | NGK | 6 | £60 – £90 | £10 – £15 |
| CLA | Denso | 4 | £40 – £60 | £10 – £15 |
| CLS | Champion | 6 | £60 – £90 | £10 – £15 |
| GLC | Beru | 4 | £40 – £60 | £10 – £15 |
| Sprinter | Bosch | 4 | £40 – £60 | £10 – £15 |
| Vito | NGK | 4 | £40 – £60 | £10 – £15 |
Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC
-21%
Article number: 1496
compared to
RRP
£23.65
£18.49
Price per item
£73.96 / Price per 4 items
price incl. 20% VAT, excl. delivery costs
BOSCH Spark plug
M 14 x 1,25, Spanner Size: 16 mm
Article number: 0 242 240 653
£11.49
Price per item
£45.96 / Price per 4 items
price incl. 20% VAT, excl. delivery costs
Article number: K20PR-U
£3.29
Price per item
£13.16 / Price per 4 items
price incl. 20% VAT, excl. delivery costs
BOSCH Spark plug
M 12 x 1,25, Spanner Size: 16 mm
Article number: 0 242 145 510
£11.49
Price per item
£45.96 / Price per 4 items
price incl. 20% VAT, excl. delivery costs
-39%
Article number: Z100
compared to
RRP
£6.62
£3.99
Price per item
£15.96 / Price per 4 items
price incl. 20% VAT, excl. delivery costs
The ignition system is a crucial component of the Mercedes-Benz engine. The spark plugs you choose therefore have a direct influence on the performance and service life of your vehicle. When selecting the parts, particular attention must be paid to the electrode material as this usually determines the service life and performance characteristics.
Spark plugs with a centre electrode made of a copper alloy are the standard option available. They guarantee reliable sparks at an affordable price, but must be replaced every 25,000 - 30,000 kilometres. This is a rational solution for car owners who value cost-effective maintenance with reasonable efficiency.
There are two more expensive but efficient options: iridium and platinum. Iridium spark plugs for Mercedes-Benz offer the maximum service life - up to 100,000 kilometres of mileage. Their advantage lies in their resistance to contamination, which helps to optimise the combustion process. Platinum spark plugs are in the mid price segment with a replacement interval of around 50,000 kilometres. Due to the reduced wear of the electrodes, they represent the optimum balance between price and durability.
When choosing the right spark plugs for your car, you should be guided by your own preferences: economy, service life, or optimum engine performance.
If you find defective spark plugs in your Mercedes-Benz, it is advisable to replace the whole set. This is because all spark plugs should have identical properties, preferably from a single product line. Differences in electrode material, part condition, or quality of spark formation can lead to engine issues. Replacing the entire set of spark plugs at the same time ensures smooth engine operation and prevents problems caused by inconsistent combustion.
In 2025, the average price of replacing a spark plug on a Mercedes-Benz at a garage will be between £50 and £200 - that's how much a mechanic is paid for their work. This price does not include the cost of the components themselves. A cost overview can be found in the table below.
| Mercedes-Benz model | Recommended brands | Cost of replacement excl. parts(£) | Replacement time (in hours) |
|---|---|---|---|
| A-Class | Bosch | £50 – £150 | 1 – 1.5 |
| B-Class | NGK | £50 – £150 | 1 – 1.5 |
| C-Class | Denso | £50 – £150 | 1 – 1.5 |
| C-Class W204 | Champion | £50 – £150 | 1 – 1.5 |
| C-Class W205 | Beru | £50 – £150 | 1 – 1.5 |
| E-Class | Bosch | £75 – £180 | 1.5 – 2 |
| A-180 | NGK | £50 – £150 | 1 – 1.5 |
| C-180 | Denso | £50 – £150 | 1 – 1.5 |
| C-200 | Champion | £50 – £150 | 1 – 1.5 |
| W203 | Beru | £50 – £150 | 1 – 1.5 |
| W211 | Bosch | £75 – £180 | 1.5 – 2 |
| W212 | NGK | £75 – £180 | 1.5 – 2 |
| CLA | Denso | £50 – £150 | 1 – 1.5 |
| CLS | Champion | £75 – £180 | 1.5 – 2 |
| GLC | Beru | £50 – £150 | 1 – 1.5 |
| Sprinter | Bosch | £50 – £150 | 1 – 1.5 |
| Vito | NGK | £50 – £150 | 1 – 1.5 |
Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC Sold by AUTODOC
-19%
NGK Spark plug
M14 x 1,25, Spanner Size: 20,8 mm
Article number: 4511
compared to
RRP
£3.72
£2.99
Price per item
£11.96 / Price per 4 items
price incl. 20% VAT, excl. delivery costs
Article number: 7811
£2.99
Price per item
£11.96 / Price per 4 items
price incl. 20% VAT, excl. delivery costs
-16%
Article number: K20TT
compared to
RRP
£4.79
£3.99
Price per item
£15.96 / Price per 4 items
price incl. 20% VAT, excl. delivery costs
-38%
Article number: IK20TT
compared to
RRP
£20.42
£12.49
Price per item
£49.96 / Price per 4 items
price incl. 20% VAT, excl. delivery costs
-38%
Article number: IXEH22TT
compared to
RRP
£22.09
£13.49
Price per item
£53.96 / Price per 4 items
price incl. 20% VAT, excl. delivery costs
Starting problems: Difficulty when starting the vehicle, especially at low temperatures, due to the increased load on the engine caused by worn spark plugs.
Engine performance issues:
Reduced efficiency:
Warnings:
You can replace the spark plug yourself if there are signs of spark plug failure or various defects. Let's take a look at this brief guide.
Frequency of replacement:
Preparation:
Prepare the tools:
Important notes:
General procedure:
The AUTODOC video tutorial shows the complete process of replacing the spark plugs in a Mercedes-Benz in detail. It demonstrates the procedure for removing the components, the tools required, and key technical aspects of the installation. This video will help you to do the job professionally!
A useful video on this topic:
CHAMPION Spark plug
N9YC, M14x1.25, Spanner Size: 21 mm, Nickel GE
Sold by AUTODOC
DENSO Spark plug
M14x1.25,
Sold by AUTODOC
BOSCH Spark plug
M 14 x 1,25, Spanner Size: 16 mm
Sold by AUTODOC
CHAMPION Spark plug
XC92YC, M14x1.25, Spanner Size: 16 mm, Nickel GE
Sold by AUTODOC
DENSO Spark plug
M12x1.25,
Sold by AUTODOC
BOSCH Spark plug
M 12 x 1,25, Spanner Size: 16 mm
Sold by AUTODOC
CHAMPION Spark plug
RERX4ZWYPB3, M12x1.25, Spanner Size: 14 mm Bi-Hex, Pt GE
Sold by AUTODOC
BERU Spark plug
14 FR-6 DPU02S, M14x1,25, Spanner Size: 16 mm
Sold by AUTODOC
NGK Spark plug
CNG/LPGM14 x 1,25, Spanner Size: 16 mm
Sold by AUTODOC
BOSCH Spark plug
M 14 x 1,25, Spanner Size: 16 mm
Sold by AUTODOC