Spark Plug Replacement at your home or office in Vernon Hills.

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Average rating from customers who
received a Spark Plugs Replacement.
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$86.47 - $610.45

Price range for all vehicles


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Average rating from customers who
received a Spark Plugs Replacement.
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Recent Spark Plug Replacement reviews in Vernon Hills

Excellent Rating


YourMechanic Spark Plug Replacement Service

Average Rating

4.9/5

Number of Reviews

3,267

Rating Summary
3,074
118
15
12
48
3,074
118
15
12
48
Chris

Chris

19 years of experience
1240 reviews
Chris
19 years of experience
Very knowledgeable, fast and came early! Only tells you what you need! Highly recommend!
Chris always does a great job on my vehicles and is always on time and usally early.
Ira

Ira

33 years of experience
241 reviews
Ira
33 years of experience
Great as usual.
Ricky

Ricky

8 years of experience
31 reviews
Ricky
8 years of experience
Ricky is experienced, knowledgable, professional and friendly. The work is done as smoothly as possible.
Brandon

Brandon

15 years of experience
318 reviews
Brandon
15 years of experience
My 2nd time Brandon has helped me out. Does an awesome job and knows his stuff.
Ricardo

Ricardo

20 years of experience
145 reviews
Ricardo
20 years of experience
Very knowledgeable
Ralph

Ralph

31 years of experience
58 reviews
Ralph
31 years of experience
I was very satisfied with Ralph's work. The Cherokee runs very well. Thank you, Ralph.
Jim

Jim

18 years of experience
31 reviews
Jim
18 years of experience
Job well done on time
Dan

Dan

36 years of experience
611 reviews
Dan
36 years of experience
Super nice guy and knows his stuff. He was on time and got the job done right. Would highly recommend!
Wesley

Wesley

13 years of experience
277 reviews
Wesley
13 years of experience
Thanks Wesley, your diagnostic of my car problem was accurate and honest, we appreciate that, and don't forget to get your forgotten tool, contact me at 720 999 5278 to retrieve it.
Joel

Joel

18 years of experience
562 reviews
Joel
18 years of experience
Joel is an amazing mechanic. He was very honest and upfront about the issues with my car. I had my spark plugs replaced, an oil change and I also had my coils replaced. My car is running very smooth and better than before. He gets the job done and works really fast. He has never been late always a little early which is very professional. Definitely will book him again and again as I've been doing!


How much does Spark Plug Replacement cost in Vernon Hills?

It depends on the type of car you drive and the auto repair shop you go to in Vernon Hills. Our mechanics in Vernon Hills are mobile, which means they don't have the overhead that repair shops have. They provide you convenience by coming to your home or office in Vernon Hills.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2004 Pontiac Bonneville $295 $150.76 $143.98 14% $344.26
2007 Dodge Magnum $505 $321.21 $183.97 11% $568.46
2011 Honda CR-V $180 $99.68 $79.99 13% $207.18
2005 Lexus SC430 $207 $118.88 $87.98 12% $237.13
2007 Mercedes-Benz CL550 $416 $271.63 $143.98 10% $465.13
2013 Jaguar XJ $339 $75.48 $263.96 21% $430.23

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Spark Plug Replacement Service

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

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Backed by 12-month, 12.000-mile guarantee


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.

1-800-701-6230 · hi@yourmechanic.com