12120040551 Genuine BMW/Mini Spark Plug
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Genuine BMW/Mini Spark Plug | 12120040551

BMW X3, 530i, 330i, 540i, X1, 740i, 330i xDrive, X4, 540i xDrive, 530i xDrive & more
Mini Cooper, Cooper Countryman, Cooper Clubman
$25.99
Reg
$27.07
List
$27.69
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P/N: 12120040551 Genuine BMW/Mini
Description:
Latest version and brand will be shipped, may vary from image shown.
Cross References:
  • 12120041666
  • MI12120041666
  • RERX4ZWYPB

Spark plugs provide the spark needed to ignite the air/fuel mixture in each cylinder for engine combustion. High voltage from the ignition coil is transferred through the spark plug to an air gap between the spark plug tip and the spark plug ground to the engine. Once the voltage reaches the air gap, the voltage jumps the gap in the form of a spark, igniting a compressed air fuel charge inside the cylinder. The air fuel charge explodes, creating the force needed to push the cylinder down and turning the engine crankshaft to propel the engine. In short, spark plugs serve a vital function in keeping your vehicle running properly.

Components of a Spark Plug
  • A metal terminal that connects to the ignition system
  • A center electrode for current to flow through the spark plug with a tip for the current to jump making the spark
  • A ribbed ceramic insulator to keep current flowing through the spark plug center electrode and not into other parts of the engine
  • A threaded metal case to anchor the spark plug into the cylinder head with a ground electrode for the spark to jump to
  • A seal to seal the spark plug case to the cylinder head to prevent cylinder compression from escaping
Types of Spark Plugs

The biggest differences in spark plug construction are the materials used for the electrodes, their conductivity, and their wearability.

  • Copper is the base material for the center electrode on most spark plugs as it provides superb conductivity. These tend to wear quickly from the electrical transfer created by the spark and fully copper spark plugs need to be replaced every 15,000 miles.
  • Copper core spark plugs with yttrium or nickel tipped electrodes and grounds take longer to wear and can last up to 30,000 miles.
  • Platinum tipped copper core electrodes wear even less, provide superior conductivity, and can last up to 60,000 miles.
  • Iridium tipped copper core spark plugs wear the least and can last over 100,000 miles.

When a spark plug fails prematurely it will provide a weak spark or no spark at all. Causes of premature spark plug failure can include oil leaking from the valve cover into the spark plug chamber, your engine running too lean and overheating the spark plug, and your engine running too rich and fuel fouling the plug.

Most engines are designed to run on only one type of spark plug based on its use. Be sure to check your owner’s manual for the right type of spark plug needed for your vehicle.

View more Genuine BMW Spark Plugs.

Any Genuine brand part is obtained directly through our vehicle dealership network from your vehicle's manufacturer. This is always your best option for getting the exact same part that is being replaced and will be the latest version design.
Left = Driver side and Right = Passenger side.
All parts are priced individually unless identified as a set or kit. "Per car" notes identify how many of a given part your car has and "Left/Right or Front/Rear" notes means the part fits the left or right side of the car. These parts are still sold individually and you'll need to select the appropriate quantity if you plan to replace more than one of this item.

Frequently Viewed Together

We found 10 additional part(s) that are frequently viewed together.

Why Buy OEM & Genuine Replacement Auto Parts from AutohausAZ?

Auto parts at wholesale prices is what you will find at AutohausAZ. Have you been searching the web for auto parts for your vehicle? You have come to the right place! Here at Autohaus, we strive to offer low prices on quality replacement parts and providing first rate customer service.

What This Genuine BMW/Mini Spark Plug Fits?

Application information below is for reference only and should not be used to determine the exact vehicle fitment. Please use the "Make Sure It Fits" vehicle selection box above to determine the exact fitment and review any application notes. If you need any help determining if this part works with your vehicle, please don't hesitate to contact us.

BMW
17-21 - 230i
17-21 - 230i xDrive
16-18 - 330e Base, iPerformance
17-18 - 330i
17-19 - 330i GT xDrive
17-18 - 330i xDrive
19-19 - 330i xDrive
Body Type: Wagon
16-18 - 340i
17-19 - 340i GT xDrive
16-18 - 340i xDrive
17-20 - 430i
17-20 - 430i Gran Coupe
17-20 - 430i xDrive
17-20 - 430i xDrive Gran Coupe
17-20 - 440i
17-20 - 440i Gran Coupe
17-20 - 440i xDrive
17-20 - 440i xDrive Gran Coupe
18-20 - 530e Base, iPerformance
Mini
16-19 - Cooper Base, John Cooper Works, S
14-15 - Cooper Base, John Cooper Works, S
Body Type: Hatchback
16-19 - Cooper Clubman Base, ALL4, John Cooper Works ALL4, S, S ALL4
17-22 - Cooper Countryman Base, ALL4, John Cooper Works ALL4, S, S ALL4 & more