Mercedes-Benz S420 Ignition Coil Replacement at your home or office.

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Ignition Coil Replacement Service

How much does a Ignition Coil Replacement cost?

On average, the cost for a Mercedes-Benz S420 Ignition Coil Replacement is $405 with $243 for parts and $161 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1999 Mercedes-Benz S420V8-4.2LService typeIgnition Coil ReplacementEstimate$681.52Shop/Dealer Price$832.79 - $1219.63
1994 Mercedes-Benz S420V8-4.2LService typeIgnition Coil ReplacementEstimate$653.06Shop/Dealer Price$805.77 - $1196.81
1995 Mercedes-Benz S420V8-4.2LService typeIgnition Coil ReplacementEstimate$653.06Shop/Dealer Price$805.76 - $1196.80
1996 Mercedes-Benz S420V8-4.2LService typeIgnition Coil ReplacementEstimate$647.52Shop/Dealer Price$798.77 - $1185.60
1998 Mercedes-Benz S420V8-4.2LService typeIgnition Coil ReplacementEstimate$647.52Shop/Dealer Price$798.88 - $1185.80
1997 Mercedes-Benz S420V8-4.2LService typeIgnition Coil ReplacementEstimate$647.52Shop/Dealer Price$798.84 - $1185.72
Show example Mercedes-Benz S420 Ignition Coil Replacement prices

What is an ignition coil and how does it work?

An ignition coil transforms ignition voltage (12 volts) to the very high voltage pulses (20,000 volts or more) that fire the spark plugs. The number of ignition coils varies depending on car model and year of production. Older cars will have one coil covering all engine cylinders while newer cars may have a coil-on-plug type arrangement — that is every cylinder will have its own dedicated ignition coil.

Ignition Coils

When to consider replacing an ignition coil:

  • Hard starting or no start. Ignition coils are subject to heat damage and electrical overload, both of which can cause partial or total failure. If the coil is faulty, you may have difficulty starting your car or it may not start at all.
  • Misfiring, loss of power, poor acceleration. Once the car is running, a bad ignition coil can cause poor operation of the engine. Should you have misfiring or loss of power, faulty ignition coils would be among the list of causes a mechanic would investigate. The Check Engine Light will often come on with a trouble code(s) indicating which cylinders are involved.

How do mechanics replace the ignition coil?

  • The ignition is checked to assure it is in the “off” position.
  • For single coils that supply all cylinders, the coil is disconnected from either a bracket located in the engine compartment or, in some cases, is removed from within the distributor. The replacement coil is secured and all electrical connections reattached. If the distributor was removed for any reason, the timing is adjusted as required.
  • For individual coil-on-plug applications, the coil is detached from the top of the individual spark plug and replaced.
  • Once the coil is securely in place, all electrical connections are reattached, and timing adjusted as needed, the car is road tested to ensure normal operation.

Is it safe to drive with an ignition coil problem?

Yes. A malfunctioning ignition coil will cause loss of power and lower fuel efficiency but that will not present an immediate safety issue. If the coil malfunction is causing misfiring, this will allow unburned fuel to enter and permanently damage the catalytic converter from overheating.

When replacing an ignition coil keep in mind:

  • Ignition coil failure can be caused by faulty spark plugs or wires. The mechanic will inspect and may recommend replacement of those components.
  • In a coil-on-plug ignition system, if only one coil fails, you need only replace the faulty coil. Remaining functioning coils can be left in place.
  • In systems with the coil located in the distributor, it may be more cost-effective to replace the entire distributor rather than remove and replace just the coil.

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Tien

23 years of experience
903 reviews
Tien
23 years of experience
Mercedes-Benz S420 V8-4.2L - Water Pump - Moraga, California

Eric

15 years of experience
133 reviews
Eric
15 years of experience
Mercedes-Benz S420 V8-4.2L - Oil Change - Bowie, Maryland
Kept me informed for his arrival. Was very friendly.

Tam

22 years of experience
251 reviews
Tam
22 years of experience
Mercedes-Benz S420 V8-4.2L - Fuel Filter - San Francisco, California

Manuel

12 years of experience
82 reviews
Manuel
12 years of experience
Mercedes-Benz S420 V8-4.2L - Car is overheating - Naples, Florida
Very prom and good mechanic .

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