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Denso 5040 Spark Plug
| Brand | Denso 5040 |
|---|---|
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Nickel |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Ground Electrode Quantity | 1 |
| Ground Electrode Tip Design | U-Groove |
| Hex Size | 16.0 |
| Manufacturer Heat Range | 22 |
| Pre-Gap Size | 0.8 |
| Reach | 18.00 |
| Seat Type | Tapered |
| Thread Diameter | 14.00 |
| Product line | U-Groove Conventional |
| Fits | Ford and Jaguar · 9 vehicles |
U-Groove design. Improves ignitability for more efficient engine operation.
Copper core. Helps promote consistent spark performance.
Tapered seat. Provides a secure, precise spark plug fit.
Cross-references DENSO Auto Parts T22EP-U, Ford AWSFA12C and Jaguar EBC4021 for the same application. See all 3.
Denso 5040 U-Groove Conventional Spark Plug
Denso 5040 is a conventional spark plug built with a U-Groove ground electrode design to improve ignitability and support more efficient engine operation. It is a direct-fit ignition component for select Ford Taurus and Jaguar V12 applications, including Jaguar XJ12, XJS, and XJRS models.
Key Features
- U-Groove ground electrode tip design for improved spark exposure
- Conventional spark plug construction for secondary ignition service
- Nickel ground electrode tip and nickel ground electrode core material
- Copper center electrode core material for stable conductivity
- Pre-gapped to 0.8 mm
- Tapered seat design with 14.00 mm thread diameter and 18.00 mm reach
- 16.0 mm hex size for proper socket fitment
- Manufacturer heat range 22
Product Details
This Denso U-Groove Conventional spark plug is engineered around a nickel-tipped ground electrode and copper-core center electrode to deliver consistent ignition performance in the cylinder head. The U-Groove profile increases the spark path exposure, which helps support reliable combustion and engine efficiency in the specified Ford and Jaguar applications. Part number 5040 also cross-references Denso Auto Parts T22EP-U for the same application.
Vehicle Fitment
- Fits 1996-1998 Ford Taurus, N/A
- Fits 1994-1996 Jaguar XJ12, N/A
- Fits 1994-1995 Jaguar XJS, N/A
- Fits 1993 Jaguar XJRS, N/A
Common Replacement Reasons
- Engine misfire or rough idle
- Hard starting or extended crank time
- Reduced fuel efficiency from worn ignition components
- Weak spark performance under load
- Maintenance replacement for worn spark plugs
Installation Notes
Verify thread diameter, reach, seat type, and heat range before installation. This plug uses a tapered seat and 14.00 mm threads, so it must match the cylinder head specification exactly. Check and confirm the pre-gap against the engine requirement before use, and install with the correct spark plug socket size.
Quality Assurance
Denso manufactures ignition components for OE-style service applications, and the 5040 is built to the listed dimensional and material specifications for accurate fitment in the confirmed Ford Taurus and Jaguar applications.
| Year | Make | Model | Fuel Type | Position | Notes |
|---|---|---|---|---|---|
| 1998 | Ford | Taurus | FLEX | N/A | U-Groove Conventional |
| 1997 | Ford | Taurus | FLEX | N/A | U-Groove Conventional |
| 1996 | Ford | Taurus | FLEX | N/A | U-Groove Conventional |
| 1996 | Jaguar | XJ12 | — | N/A | U-Groove Conventional |
| 1995 | Jaguar | XJ12 | — | N/A | U-Groove Conventional |
| 1995 | Jaguar | XJS | — | N/A | U-Groove Conventional |
| 1994 | Jaguar | XJ12 | — | N/A | U-Groove Conventional |
| 1994 | Jaguar | XJS | — | N/A | U-Groove Conventional |
| 1993 | Jaguar | XJRS | — | N/A | U-Groove Conventional |
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