An ignition coil is a compact electrical transformer that boosts the 12-volt current from the battery into the high voltage (15,000-20,000 volts or more) needed to start a car. Typically there is one ignition coil for each spark plug, either sitting on top of each spark plug (eliminating the need for spark plug wires) or physically connected together as a coil pack that is installed and replaced as a single unit. Symptoms of a bad coil pack include misfires, poor fuel consumption or loss of power -- although these can be caused by other factors.
Typical costs:
An ignition coil typically costs $70-$375 or more depending on the make and model of vehicle, if it is a single coil or a coil pack, and whether the part is made by the vehicle manufacturer (called OEM parts, and typically more expensive) or an aftermarket product from a company other than the vehicle manufacturer.
For example, AutoZone[1] offers an aftermarket ignition coil for a 2008 Ford Focus for $103; FordParts.com[2] offers ignition coils for the same vehicle for $72-$159. Replacing an ignition coil can be a relatively straightforward do-it-yourself project. AutoMD provides how-to instructions[3] , and estimates it as a moderately complex project that takes about an hour.
Professional installation typically takes 0.5-1.5 hours, depending on the vehicle, at $50-$120 an hour (depending on whether the work is done at an independent or chain repair shop, or at a dealership, which is typically more expensive). This brings total costs to $100-$550 or more.
For example, RepairPal.com[4] estimates replacing a single ignition coil on a 2008 Ford Focus costs about $37-$49 for labor and $123-$144 for parts, making a total cost of about $160-$193; for a 2008 Dodge Ram 1500 truck the estimate is about $102-$135 for labor and $74-$120 parts, or $176-$255 total; for a 2008 Toyota Camry it's $74-$98 labor and $102-$210 parts, with a total of $176-$308.
Coil packs can provide an extremely large spark to each cylinder when needed, but if one coil in the pack fails, the entire pack needs to be replaced. With "coil on plug" ignition where one coil is sitting on top of each spark plug, only a failed coil needs to be replaced, and when diagnosing an ignition coil failure, it's possible to swap the coils around, to determine which one is bad. Auto parts distributor 1A Auto explains the types of ignition coils[5] .
Replacing an ignition coil is a fairly straightforward task; the new coil should be carefully inspected to ensure it is exactly the same as the old part (that the dimensions are identical, and any holes or other features are the same size and in the same position). AutoMD provides detail of an interally mounted ignition coil[6] (inside the distributor cap).
Additional costs:
The coil wires, spark plugs and spark plug wires should be inspected when the ignition coil is replaced; if cracks or corrosion is found, replacing these parts can add $50-$350 or more to the total cost.
AA1Car.com Automotive Diagnostic and Repair explains how to test an ignition coil[7] .
Shopping for ignition coil replacement:
A coil pack or individual coil can be replaced by a car dealership, an independent repair shop, or car-repair chains like Pep Boys[8] or Sears[9] . Both the National Institute for Automotive Service Excellence[10] and the International Automotive Technicians Network[11] provide a searchable directory of repair shops.
Consumer Reports lists tips for finding a good mechanic[12] .
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Charged 182.83 for diagnosis 389.61 labor 395.40 for parts. I think this is exhorbitant! Looked up parts on line. Coil sets of 4 run from 50. To 120.00. Sparke plugs about 5.00 to 8.00 each. Mine must be gold plated. Gave me " discount" totla was still $684.00 Outrageous!!!
How did I "negotiate" the price down from from a $1700 estimate including unrelated work, to an amount within cents of my bank account balance? Sure, it was Saturday, I thought I had to pass the emissions test the next day, the parts for the no longer manufactured Sable run $300 retail, but really? And I had to go back because they did not hook up the vacuum hoses correctly!
Check engine light came on, code was P0303, third cylinder. Googled causes of code found ignition coil and spark plugs most likely. Ordered parts from Amazon and my husband and I changed them after watching some YouTube videos. Found oil in the well where the sparks plugs were, so ordered valve cover gasket set and paid my best friend's son $50 to install it. Cost for all was $107, including the $50 paid to friend.
I bought 1 Denso ignition coil from Napa for $70 (includes tax) and the remaining 5 from RockAuto for $191 (includes tax and shipping). At first I only bought 1 from Napa because I got a code for 1 cylinder. A couple of weeks later after changing that 1 coil, I got a misfire in another cylinder. Figured it was best to change the remaining coils. Was able to change the right bank without removing the plenum thanks to a YouTube video.
need to replace 4 ignition coils that were burned, spark plugs were good so no need to change them. Costs were $330 for parts, $160 for labor, $80 for diagnosis
Codes P0303 and P0300. Replaced all 4 coils and 4 spark plugs. $775 for parts and $380 for labor. Might have gotten taken for a ride on these prices, but my car was shaking violently in idle and having a lot of trouble accelerating, I didn’t really have time to shop around.
4 coils replaced thought this was really expensive for just 4 little parts but looking at these other costs I guess this looks like I'm not getting screwed over
Kelly's said hood seal is letting water in and it makes it's way to coil; puddle ruins coil. The check engine light came on and stayed on. Seemed to have a slight shake in idling and gas gave it no power. Order new hood seal from GM, all parts and labor total $538.
Code was P0354, cylinder #4 Misfire. Tech swapped the coil to another cylinder and the code moved with the coil swap. Parts were $105 and labor was $165 including the $99 diagnostic.
68,000 miles bought new! engine light blinking then stay on-car bucking -step on gas seemed to clear up for awhile-took to garage several times work for couple days then start again replace 1 coil and plug week later same replayce a 2nd one start again Now replacing all will see how this goes
Posted by: Yellow Submarine RV in Island Lake, IL.
Posted: September 12th, 2015 09:09AM
Car Make: Ford
Car Model: F450
Car Year: 2012
Auto Shop: Camping World
Our warranty covered $130 of the $562. Our out of pocket was $432. I don't understand why or how this happened on such a low mileage vehicle. Autozone detected P0300 Service Engine Light code. We were able to drive 300 miles to get home.
This is the stupidest idea any car maker ever came up with. These things are ungodly expensive. What would have been the problem with improving the spark plug and plug wires? But then no one with an IQ over 99 did not need the dealer to do a tune-up or labor. What a racket!
One coil slowly went bad. What made the diagnosis a little bit of a challenge was that it failed intermittently before dying. The car bucked occasionally. Then the check engine light came on and an AutoZone showed the #4 cylinder misfire. Now it got easy. Replaced the spark plug and no improvement. Replaced the coil atop the plug and problem solved. However, the other igniters might be harder to replace because the fuel galley is right above some of them.
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