Champion 991 spark plug for the 2010-2019 Jaguar XJ V8 5.0L and other vehicles ignites the air-fuel mixture in the cylinder. Its gapped electrodes carry the spark that starts each combustion cycle.
- Copper core center electrode for accurate heat range control and longer life
- Coated shell for corrosion resistance in harsh environments
- Built-in resistor minimizes electrical interference to protect sensitive electronics
- Pre-gapped to 0.035 in (0.90 mm)
- Champion Copper Plus Small Engine line
Quick facts
- Part: Champion 991 spark plug
- Fits: 2010-2019 Jaguar XJ V8 5.0L and other vehicles
- Condition: New
Hard starting, a rough idle or a misfire can mean the plugs are worn, though the ignition coils and fuel injectors can also be behind them, so find the cause before you replace plugs.
Fits
This spark plug is a direct-fit replacement for the 2010-2019 Jaguar XJ V8 5.0L, the 2018-2019 Jaguar XJR575 V8 5.0L and the 2014-2018 Jaguar F-Type V8 5.0L, and it is built to meet OE fit, form and function. If your vehicle is another Jaguar or a Polaris, look up its model and year in the "Vehicles it fits" section.
Specifications
Fit and size
- Quantity per vehicle: 8 for the Jaguar models, 2 for the Polaris models
- Pre-gap: 0.035 in (0.90 mm)
- Seat type: Flat
Build and materials
- Champion plug type: REA8MCX
- Center electrode tip material: Copper
- Washer: Crush washer, included
- Resistor: Yes
- Grade: Standard replacement
- Condition: New
- Country of origin: China
In the box
One spark plug with its crush washer. The 2010-2019 Jaguar XJ V8 5.0L takes eight, so order eight and fit them together; the Polaris models take two.
Interchange: 5682 · 12120037244 · 12120037580 · 12120037581 · 12120037582 · 12120040581 · 12127034087 · REA8MCX · 3427 · 8200662185 · 224011KC1C · C2P23089 · LR032080 · 6799 · LZKAR7A · 3022225 · 22401AA820
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
5682, 12120037244, 12120037580, 12120037581, 12120037582, 12120040581, 12127034087, REA8MCX, 3427, 8200662185, 224011KC1C, C2P23089, LR032080, 6799, LZKAR7A, 3022225, 22401AA820
Frequently Asked Questions
Does the Champion 991 work as an F-Type plug for the 2014-2018 Jaguar F-Type V8 5.0L?
Yes. Champion 991 fits the 2014-2018 Jaguar F-Type V8 5.0L, which takes eight plugs. Look up other models in the "Vehicles it fits" section.
Does the Champion 991 spark plug come with a crush washer?
Yes. A crush washer is included with the plug, which has a flat seat.
What gap is the Champion 991 pre-gapped to?
This Champion plug is pre-gapped to 0.035 in (0.90 mm), a pre-gapped design that simplifies installation.
How can I tell if a Champion 991 spark plug is worn?
Hard starting, a misfire or a rough idle can point to a worn Champion 991 plug. With the engine off and cool, a shop can inspect its electrodes and insulator for wear, deposits or cracks.
Does the Champion 991 have a resistor for noise suppression?
Yes. Champion 991 is a resistor plug, and its built-in resistor minimizes electrical interference to protect sensitive electronics.
