BMW 740Li 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 BMW 740Li Spark Plug Replacement is $286 with $76 for parts and $210 for labor. Prices may vary depending on your location.

Car	Service	Estimate	Shop/Dealer Price
2014 BMW 740LiL6-3.0L Turbo	Service typeSpark Plug Replacement	Estimate$399.56	Shop/Dealer Price$447.53 - $568.76
2012 BMW 740LiL6-3.0L Turbo	Service typeSpark Plug Replacement	Estimate$370.55	Shop/Dealer Price$413.25 - $530.53
2013 BMW 740LiL6-3.0L Turbo	Service typeSpark Plug Replacement	Estimate$370.55	Shop/Dealer Price$413.32 - $530.65
2011 BMW 740LiL6-3.0L Turbo	Service typeSpark Plug Replacement	Estimate$370.55	Shop/Dealer Price$413.31 - $530.64
2015 BMW 740LiL6-3.0L Turbo	Service typeSpark Plug Replacement	Estimate$385.14	Shop/Dealer Price$432.36 - $553.03

Show example BMW 740Li 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 BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

(14)

Rating Summary

13

1

0

0

0

13

1

0

0

0

SEE REVIEWS NEAR ME

Michael

21 years of experience

53 reviews

Request Michael

Michael

21 years of experience

Request Michael

by George Deane

740Li 2011 - Heater is not working - Southfield, MI

Gave me the real issue with my vehicle, and did not replace a part that was not needed too be! Trustworthy!

Excellent Rating

(14)

Rating Summary

13

1

0

0

0

13

1

0

0

0

SEE REVIEWS NEAR ME

Recent articles & questions

P2788 OBD-II Trouble Code: Auto Shift Manual Adaptive Learning at Limit

P2788 means an issue with the adaptive learning system of the transmission which causes stalling at idle, harsh shifting and transmission overheating.

5 Essential Things to Know When Considering Buying a Classic Car

Classic Classic cars, which are those that are at least 10 years old and have historical interest based on production numbers or workmanship, certainly play a siren song for many who want to relive memories from their youth. However, before...

What Does the Trailer Tow Hitch Warning Light Mean?

The trailer tow hitch light is designed to warn you when there is an issue with your car's tow hitch, possibly that it is unlocked.

Can you please tell me where the auto trans output speed sensor is located. Some people tell me it is under the batter?

You will need to drop the transmission pan and it's located above the valve body. If you need some assistance with its replacement, consider YourMechanic, as a certified technician can help diagnose any issues with your sensor (https://www.yourmechanic.com/services/electrical-components-are-not-working-inspection) and help...

Can I still drive my car with a partially shredded serpentine belt?

Hi there. I would not drive the vehicle if I were you until you have the serpentine belt replaced (https://www.yourmechanic.com/article/how-to-replace-a-serpentine-belt-by-mia-bevacqua). If it's partially torn, it will continue to shred and may cause additional damage to the pulleys or other components...

Start problem with good crank.blown head gasket.

Hi there: In most cases, the symptoms of white smoke and needing to add coolant frequently mean you have a blown head gasket. It can cause inconsistent starting problems as you've described, but it's also possible that the crankshaft position...

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