Bosch 8120 spark plug for the 1998-2003 Ford F-150 V6 4.2L and other vehicles ignites the air-fuel mixture in the cylinder through a fine wire, double platinum electrode design. Its platinum construction gives 3 times longer life than conventional copper spark plugs.
- Double Platinum design: platinum firing pin on the center electrode and platinum inlay in the ground electrode reduce gap erosion
- OE Fine Wire design requires up to 24% less voltage to ignite
- 360 degree continuous laser welding adds durability for longer life
- Copper core gives a broader heat range to resist pre-ignition and fouling
Quick facts
- Part: Bosch 8120 spark plug
- Fits: 1998-2003 Ford F-150 V6 4.2L and other vehicles
- Condition: New
Hard starting, a misfire or a rough idle can mean the spark plugs are worn, though an ignition coil or a fuel injector may be behind the same symptoms, so find the cause before you replace anything.
Fits
This spark plug is listed for a wide range of Ford, Mercury and Lincoln models, among others. It is also a spark plug for the 2005-2010 Ford Explorer V6 4.0L and the 2006-2011 Ford Ranger V6 4.0L. If your truck or car is not named here, look up your year and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Quantity per vehicle: 4, 6 or 8, depending on the engine
- Pieces per listing: 1
- Spark plug type: 4-cycle
Build and materials
- Electrodes: platinum center electrode firing pin and platinum ground electrode inlay
- Core: copper
- Insulator type: projected
- Resistor: yes
- Thread finish: nickel plated
- Condition: new
- Warranty: Bosch 5 year customer satisfaction guarantee and 1 year Technician Warranty
In the box
One spark plug. A V6 engine takes six spark plugs, one per cylinder, while the 4-cylinder and V8 engines in the listings take four or eight, so order one per cylinder and fit the full set together.
Installation notes
- Pre-gapped from the factory, so no gap adjustment is needed.
- Nickel-plated threads mean no anti-seize is required.
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
Is this a Ford F-150 spark plug for the 1998-2003 V6 4.2L?
Yes. Bosch 8120 is listed for the 1998-2003 Ford F-150 V6 4.2L, and that engine takes six plugs. For other years or engines, use the "Vehicles it fits" section.
Does the Bosch 8120 come as a single plug or a full set?
The Bosch 8120 listing is one spark plug with no extra hardware. Order one for each cylinder: four, six or eight depending on the engine.
What is the electrode on this spark plug made of?
The center electrode has a platinum firing pin, and the ground electrode has a laser-welded platinum inlay. The plug also has a copper core.
Are Bosch platinum spark plugs pre-gapped?
Yes. This plug leaves the factory already gapped and has nickel-plated threads, so you do not adjust the gap or add anti-seize.
What does the OE Fine Wire design do on this spark plug?
The OE Fine Wire design needs up to 24% less voltage to ignite. A copper core also gives this plug a broader heat range to resist pre-ignition and fouling.
