BMW 540i 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 BMW 540i Spark Plug Replacement is $256 with $88 for parts and $168 for labor. Prices may vary depending on your location.

Car	Service	Estimate	Shop/Dealer Price
2001 BMW 540iV8-4.4L	Service typeSpark Plug Replacement	Estimate$1032.54	Shop/Dealer Price$1219.29 - $1748.34
2002 BMW 540iV8-4.4L	Service typeSpark Plug Replacement	Estimate$1012.72	Shop/Dealer Price$1192.66 - $1716.61
2018 BMW 540iL6-3.0L Turbo	Service typeSpark Plug Replacement	Estimate$508.39	Shop/Dealer Price$590.45 - $831.22
2003 BMW 540iV8-4.4L	Service typeSpark Plug Replacement	Estimate$1012.72	Shop/Dealer Price$1192.75 - $1716.77
1997 BMW 540iV8-4.4L	Service typeSpark Plug Replacement	Estimate$380.23	Shop/Dealer Price$432.35 - $570.35
2020 BMW 540iL6-3.0L Turbo	Service typeSpark Plug Replacement	Estimate$614.59	Shop/Dealer Price$723.38 - $1043.93
2021 BMW 540iL6-3.0L Turbo Hybrid	Service typeSpark Plug Replacement	Estimate$614.59	Shop/Dealer Price$723.22 - $1043.65
1999 BMW 540iV8-4.4L	Service typeSpark Plug Replacement	Estimate$1012.72	Shop/Dealer Price$1192.75 - $1716.77

Show example BMW 540i 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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Reuben

36 years of experience

7 reviews

Reuben

36 years of experience

by Dier

BMW 540i V8-4.0L - Control Arm Assembly Replacement (Front Lower Left) - Richmond, Virginia

Reuben is a very experienced mechanic. He went extra miles to fix the problems and it turned out great! My car just passed inspection.

Jonathan

18 years of experience

138 reviews

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Jonathan

18 years of experience

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by Sweta

BMW 540i V8-4.4L - Oil or Fluid is leaking - Tempe, Arizona

Jonathan was just AWESOME on the service (oil change) he did on my BMW. I am truly impressed. Any other service that I would need with my bimmer, I am gonna ask for him. After the oil change, my car had a oil leak and I got my Brake light and Check Brake fluid light. At first I thought it was due to oil change. Later Jonathan came back again the next day and identified the it was brake oil leak. He got the place of leak within few minutes, which no other mechanic could do. This guy knows so much about German cars. Glad to have got him work on my car.

Whitney

40 years of experience

783 reviews

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Whitney

40 years of experience

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by Eugene

BMW 540i V8-4.4L - Ignition Switch - Mountain View, California

Whitney did an incredible job repairing my BMW, and I will happily recommend his service to my friends and other YourMechanic customers. When I called YourMechanic, I had no idea what was wrong with my car except that it wouldn't start. Whitney arrived within half an hour, and immediately began troubleshooting the problem. I was amazed at his fluency with all the internals, his workmanship, and his methodical approach as he ruled out the possibilities. And I loved that he explained exactly what he was doing at each step. This demystified a lot about my car, and I now feel much more qualified to do basic care/maintenance. Whitney eventually discovered that a blown fuse caused by a busted ignition was keeping electricity from reaching the fuel pump. He put in a new fuse as a temporary fix, showed me how to start the car without blowing it again, and installed the replacement ignition when it arrived a few days later. I can't overstate how happy I am with the service provided by Whitney and YourMechanic. The convenience alone is great, but Whitney's knowledge, workmanship, and positive, friendly attitude are what make me confident I will call again :) Thanks!

Manuel

42 years of experience

132 reviews

Manuel

42 years of experience

by Noel

BMW 540i V8-4.4L - Car is shaking or vibrating - San Antonio, Texas

Very professional and knowledgeable.

Excellent Rating

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