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Bosch Spark Plug; SuperPlus Heavy-Duty; Yttrium Electrode | 7905

Audi, BMW, Dodge, Ford, Honda, Jaguar, Mazda, Mercedes, Nissan, Plymouth & more
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P/N: 7905 Bosch OEM
SuperPlus Heavy-Duty; Yttrium Electrode
Enhanced yttrium version, replaces W8DC, WR8DC, and W8DC0 versions. Pregapped for normal usage.
Cross References:
  • 0021592203
  • 0031591103
  • 0031594603
  • 0241229062
  • 101000036AB
  • 12121262360
  • 12121276283
  • 99917017090
  • W01331641806
  • W01331642268
  • W01331803344
  • W01331808155
  • W01331851505
  • W8DC
  • W8DC0
  • W8DCO
  • WR8DC+

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 Bosch Spark Plugs.

Bosch is the world's largest supplier of components to the automotive industry. The Bosch product line includes alternators & starters, brakes, electronic controls and sensors, fuel system parts and management, ignition system components, and steering system components. All Bosch automotive parts are either OEM (Original Equipment Manufacturer) or made to their specs as a replacement part for the OEM unit.
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

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What This Bosch 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.

80-80 - 4000
4 per car. For Federal (non-California) models.
80-80 - 4000
For Federal (non-California) models.
73-73 - Fox
74-79 - Fox
4 per car.
70-71 - 1600 Base, Cabriolet, Touring
66-76 - 2002 Base, Cabriolet, Turbo
68-71 - 2002ti
74-74 - 3.0CS
Gap 0.024 in
74-74 - 3.0S
Gap 0.024 in
71-71 - B100 Van Base, Sportsman
Gap 0.035 in
75-76 - Colt Base, Carousel, GT
Gap 0.030 in
70-71 - D100 Pickup
Gap 0.035 in
72-78 - Courier
Gap 0.032 in
75-79 - Civic 1200
Gap 0.032 in
74-82 - XJ6 Base, C, L
Gap 0.035 in
77-80 - GLC Base, Custom, DX, LX, Sport
Gap 0.032 in
77-78 - 230
Gap 0.032 in
86-91 - 420SEL
76-79 - 450SL
76-79 - 450SLC
84-85 - 500SEC
84-85 - 500SEL
75-76 - 610
without California Emissions; Gap 0.036 in
75-75 - 620
Gap 0.036 in
76-77 - 620
without California Emissions; Gap 0.036 in
75-76 - 710
without California Emissions; Gap 0.036 in
75-76 - B210
Gap 0.036 in
76-77 - Arrow Base, GS, GT
Gap 0.030 in
67-67 - Firebird Base, Sprint
Gap 0.035 in
79-79 - 911 SC
6 per car.
78-78 - 911 SC
Gap 0.028 in
79-79 - 928
8 per car.
78-78 - 928
Gap 0.028 in
80-81 - Brat DL, GL
78-80 - Brat DL, GL
Gap 0.032 in
76-81 - DL 4WD
Gap 0.032 in
76-81 - DL FWD
Gap 0.032 in
80-80 - GL 4WD
81-81 - GL 4WD
Engine VIN: 4
Engine VIN: 5
81-81 - GL FWD
Engine VIN: 5
Gap 0.032 in; Engine VIN: 4
79-80 - GL FWD
Gap 0.032 in
75-77 - Celica GT, ST
Gap 0.032 in
68-79 - Corolla Base, Custom, Custom RWD, DLX, SR5
Gap 0.032 in
75-77 - Corona Base, Custom, DLX, SR5
Gap 0.032 in
79-81 - Land Cruiser
Gap 0.032 in
75-78 - Land Cruiser
Gap 0.040 in
74-74 - Land Cruiser
without California Emissions; Gap 0.032 in
74-79 - Dasher
80-80 - Dasher
For Federal (non-California) models.
92-96 - EuroVan Base, Camper, CL, GL, GLS & more
Original 3 electrode plug no longer available from Bosch, this enhanced version makes an excellent replacement.
80-80 - Jetta
For Federal (non-California) models.
75-79 - Rabbit
80-80 - Rabbit
For Federal (non-California) models.
75-79 - Scirocco
80-80 - Scirocco
For Federal (non-California) models.