Bosch
OE Fine Wire Platinum

Bosch 6721 Spark Plug

Brand Bosch 6721
Center Electrode Core Material Nickel-Yttrium and Copper
Center Electrode Tip Material Platinum
Ground Configuration Standard
Ground Electrode Quantity 1
Ground Electrode Tip Design Tapered
Ground Electrode Tip Material Nickel-Yttrium
Hex Size 16
Insulator Material Ceramic
Insulator Type Projected
Manufacturer Heat Range 8
Outdoor Power Equipment Application No
Package Contents Spark Plug
Pre-Gap Size 1.1
Product Length 3.125984 in
Product Width 0.748031 in
Reach 19
Resistance 6000
Resistor Yes
Seat Type Flat
Short Style No
Spark Plug Type 4-Cycle
Thread Diameter 14
Product line OE Fine Wire Platinum
Fits Dodge, Jeep, and Nissan · 114 vehicles

OE fine wire platinum. Engineered to meet or exceed OE platinum spark plug specifications.

Platinum firing pin. Improves ignitability and fuel efficiency.

Tapered ground electrode. Promotes efficient combustion with a fine-wire design.

$13.86Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $13.86
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.

Bosch OE Fine Wire Platinum Spark Plug 6721

Bosch OE Fine Wire Platinum spark plug 6721 is built for drivers who want OE-style ignition performance with a platinum firing pin and fine-wire electrode design. It is engineered to meet or exceed original equipment specifications for platinum spark plugs and is a direct choice for select Dodge, Jeep, and Nissan applications.

The Bosch OE Fine Wire Platinum line focuses on consistent spark delivery, improved ignitability, and fuel efficiency. For vehicles such as the Dodge Dakota, Dodge Durango, Dodge Ram 1500, and Nissan Pickup, this plug provides a factory-style replacement with a preset gap and a tapered ground electrode.

Key Features

  • Platinum center electrode tip for stable ignition performance
  • Fine-wire design helps improve ignitability
  • Tapered ground electrode for OE-style combustion support
  • Resistor spark plug with 6000 ohm resistance
  • Preset 1.1 mm gap; do not gap before installation
  • Flat seat, projected insulator, and 14 mm thread diameter
  • OE Fine Wire Platinum line for factory-style replacement needs

Product Details

Bosch 6721 uses a platinum firing pin on the center electrode, nickel-ytttrium ground tip material, and a nickel-ytttrium/copper core construction to support reliable spark transfer. The 19 mm reach, 16 mm hex size, and heat range 8 make it a fitment-specific spark plug for select 4-cycle engines. This part cross-references common OE-style applications for the same vehicle coverage.

Compatible With 1997-2003 Dodge Dakota, 1998-2003 Dodge Durango, 2000-2003 Dodge Ram 1500, 1995-1997 Nissan Pickup, and 1990-1994 Nissan D21. Bosch 6721 also appears in select Dodge Ram van and Jeep Grand Cherokee applications listed in the fitment data.

Common Issues This Plug Can Address

  • Hard starting caused by worn spark plug electrodes
  • Rough idle from weak or inconsistent spark output
  • Reduced fuel economy linked to aged ignition components
  • Misfire conditions from degraded plug performance
  • Loss of throttle response in high-mileage ignition systems

Installation Notes

  • Do not gap this spark plug; the gap is preset from the factory.
  • Verify engine application and note-specific fitment before installation.
  • Use the correct torque procedure for the cylinder head material.
  • Inspect ignition wires or coil components during service to avoid repeat misfire concerns.
  • Confirm the long-nose note where listed for 1998-1999 Dodge Ram applications.

Quality Assurance

Bosch designs the OE Fine Wire Platinum line to meet or exceed original equipment specifications for platinum spark plugs. Bosch 6721 is built as an OE-style replacement for select Dodge, Jeep, and Nissan vehicles, including 1997-2003 Dodge Dakota and 1990-1994 Nissan D21 applications.

This part fits 114 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
2003DodgeDakota5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2003DodgeDakota3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2003DodgeDurango5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2003DodgeRam 15005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2003DodgeRam 1500 Van3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2003DodgeRam 1500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2003DodgeRam 1500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2003DodgeRam 2500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2003DodgeRam 2500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2003DodgeRam 3500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2003DodgeRam 3500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeDakota3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeDakota5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeDurango5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeRam 15005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeRam 1500 Van3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeRam 1500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeRam 1500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeRam 25005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeRam 2500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeRam 2500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeRam 35005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeRam 3500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2002DodgeRam 3500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeDakota3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeDakota5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeDurango5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 15003.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 15005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 15005.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 1500 Van3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 1500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 1500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 25005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 2500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 2500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 2500 Van3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 35005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 3500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2001DodgeRam 3500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeDakota3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeDakota5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeDurango5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeDurango5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 15003.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 15005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 15005.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 1500 Van3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 1500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 1500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 25005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 2500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 2500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 35005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 3500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
2000DodgeRam 3500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeDakota3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeDakota5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeDakota5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeDurango5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeDurango3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeDurango5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 15005.2LV8—N/ADo Not Gap, Gap is Preset; with Long Nose; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 15005.9LV8—N/ADo Not Gap, Gap is Preset; with Long Nose; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 15003.9LV6—N/ADo Not Gap, Gap is Preset; with Long Nose; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 1500 Van3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 1500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 1500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 25005.9LV8—N/ADo Not Gap, Gap is Preset; with Long Nose; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 2500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 2500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 35005.9LV8—N/ADo Not Gap, Gap is Preset; with Long Nose; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 3500 Van5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1999DodgeRam 3500 Van5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeB15005.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeB15003.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeB15005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeB25005.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeB25005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeB35005.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeB35005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeDakota5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeDakota3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeDakota5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeDurango5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeDurango3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeDurango5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeRam 15005.2LV8—N/ADo Not Gap, Gap is Preset; with Long Nose; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeRam 15003.9LV6—N/ADo Not Gap, Gap is Preset; with Long Nose; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeRam 15005.9LV8—N/ADo Not Gap, Gap is Preset; with Long Nose; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeRam 25005.9LV8—N/ADo Not Gap, Gap is Preset; with Long Nose; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeRam 35005.9LV8—N/ADo Not Gap, Gap is Preset; with Long Nose; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998DodgeRam 35005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998JeepGrand Cherokee5.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1998JeepGrand Cherokee5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1997DodgeB15005.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1997DodgeB15003.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1997DodgeB25005.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1997DodgeB25003.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1997DodgeB25005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1997DodgeB35005.2LV8GASN/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1997DodgeB35005.9LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1997DodgeDakota5.2LV8—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1997DodgeDakota3.9LV6—N/ADo Not Gap, Gap is Preset; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1997NissanPickup2.4LL4—N/ADo Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1996NissanPickup2.4LL4—N/ADo Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1995NissanPickup2.4LL4—N/ADo Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1994NissanD212.4LL4—N/ADo Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1993NissanD212.4LL4—N/ADo Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1992NissanD212.4LL4—N/ADo Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1991NissanD212.4LL4—N/ADo Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1990Nissan240SX2.4LL4—N/ADo Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1990NissanD212.4LL4—N/ADo Not Gap, Gap is Preset; For City Driving; Original Center Electrode Material is Copper/Nickel; OE Fine Wire Platinum
1989Nissan240SX2.4LL4—N/ADo Not Gap, Gap is Preset; OE Fine Wire Platinum