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Denso 3257 Spark Plug
| Brand | Denso 3257 |
|---|---|
| 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 | 1.1 |
| Reach | 19.00 |
| Resistance | 5000 |
| Seat Type | Flat |
| Thread Diameter | 14.00 |
| Product line | U-Groove Conventional |
| Fits | Saab · 6 vehicles |
U-Groove design. Improves ignitability for more efficient engine performance.
Conventional spark plug. A straightforward replacement for dependable ignition service.
Nickel and copper construction. Built with durable electrode materials for consistent spark delivery.
Cross-references DENSO Auto Parts Q22PR-U11, Saab 32 00 0330 and Saab 88 51 297 for the same application. See all 3.
Denso 3257 Spark Plug for Saab
The Denso 3257 is a conventional spark plug built for direct ignition service in select Saab applications. Its U-groove ground electrode design supports stronger ignitability for more efficient combustion, making it a practical choice for Saab 9-3 and Saab 9-5 owners looking for OE-style secondary ignition service.
Key Features
- U-groove ground electrode tip design for improved spark exposure
- Nickel ground electrode tip material with a copper core center electrode
- 5000 ohm resistance for standard ignition system operation
- Pre-gapped to 1.1 mm for the listed applications
- 14 mm thread diameter, 19.00 mm reach, and flat seat design
- Fits 1999-2002 Saab 9-3 and 1999-2000 Saab 9-5
Product Details
Denso U-Groove Conventional spark plugs are engineered around a ground electrode shape that helps expose the spark kernel more effectively than a standard flat-edge design. For the Saab 9-3 and Saab 9-5, part number 3257 provides a conventional ignition service option with nickel electrode materials, a copper core center electrode, and a 1.1 mm pre-gap. This part cross-references DENSO Auto Parts Q22PR-U11 for the same application.
Use Denso 3257 when servicing select Saab ignition systems that call for a flat-seat plug with a 14 mm thread, 19.00 mm reach, and 16.0 mm hex size. The part number 3257 is a direct fit reference for 1999-2002 Saab 9-3 and 1999-2000 Saab 9-5 models listed below.
What It Helps Address
- Hard starting caused by worn or fouled spark plugs
- Rough idle from inconsistent spark delivery
- Misfire conditions related to aged secondary ignition components
- Reduced fuel efficiency from weak combustion
- Loss of throttle response from degraded plug performance
Installation Notes and Tips
Verify the vehicle’s plug specification before installation, including thread diameter, reach, seat type, and pre-gap. Inspect the ignition system, plug wells, and coil components during service, and confirm the gap remains at 1.1 mm if adjustment is required. For fitment-based searches, this plug is listed for 1999-2002 Saab 9-3 and 1999-2000 Saab 9-5, including Saab 9-3 spark plug replacement and Saab 9-5 ignition tune-up service.
- Fits 1999-2002 Saab 9-3, N/A
- Fits 1999-2000 Saab 9-5, N/A
Quality Assurance
Denso is known for OE-level ignition component engineering, and the U-Groove Conventional line focuses on dependable spark delivery with a conventional plug construction. Part number 3257 is built to the listed specifications for the confirmed Saab applications.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2002 | Saab | 9-3 | N/A | U-Groove Conventional |
| 2001 | Saab | 9-3 | N/A | U-Groove Conventional |
| 2000 | Saab | 9-3 | N/A | U-Groove Conventional |
| 2000 | Saab | 9-5 | N/A | U-Groove Conventional |
| 1999 | Saab | 9-3 | N/A | U-Groove Conventional |
| 1999 | Saab | 9-5 | N/A | U-Groove Conventional |
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