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Denso 3133 Spark Plug
| Brand | Denso 3133 |
|---|---|
| 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 | Standard |
| Hex Size | 16.0 |
| Manufacturer Heat Range | 20 |
| Pre-Gap Size | 1.1 |
| Reach | 19.00 |
| Resistance | 5000 |
| Seat Type | Flat |
| Thread Diameter | 14.00 |
| Product line | U-Groove Conventional |
| Fits | Mazda, Honda, and Ford · 43 vehicles |
OEM-quality standards. Built to match original equipment expectations.
U-groove design. Promotes a stronger spark for reliable ignition.
Copper core. Helps transfer heat efficiently for consistent performance.
Cross-references DENSO Auto Parts KJ20CR11, Mazda 0000-18-F285 and Mazda AGSP33C for the same application. See all 5.
Denso 3133 U-Groove Spark Plug
The Denso 3133 is a U-Groove Conventional spark plug built to OEM quality standards for steady ignition performance and dependable secondary ignition service. It is a direct-fit option for a range of Mazda, Honda, and Ford applications, including Mazda Millenia, Mazda 626, Mazda MX-6, Honda Accord, and Honda Civic.
Key Features
- U-Groove Conventional design for consistent spark exposure
- 5000 ohm resistor for radio noise suppression
- Copper center electrode core for efficient heat transfer
- Nickel center and ground electrode tip materials
- Standard ground electrode configuration with one ground electrode
- Flat seat design with 14.00 mm thread diameter and 19.00 mm reach
- Pre-gapped to 1.1 mm
- 16.0 mm hex size for standard service tools
Product Details
Denso 3133 is part of the U-Groove Conventional line, a spark plug family focused on OE-style fit and stable ignition characteristics. The U-groove electrode profile helps maintain a defined spark path, while the copper core supports heat dissipation and the nickel electrode materials provide a durable firing surface. This spark plug cross-references DENSO Auto Parts KJ20CR11 for the same application.
What It Helps Address
- Hard starting caused by worn or fouled spark plugs
- Rough idle and inconsistent combustion
- Misfire conditions related to weak ignition output
- Reduced throttle response from degraded spark delivery
- Radio interference concerns addressed by the 5000 ohm resistor
Installation Notes and Tips
Verify thread diameter, reach, seat type, and heat range before installation. The Denso 3133 uses a flat seat, 14.00 mm thread diameter, 19.00 mm reach, and a manufacturer heat range of 20. Confirm the gap specification against the vehicle service information before installation, even though the plug is pre-gapped to 1.1 mm. For fitment reference, this part fits 1990-1997 Mazda 626, 1990-1997 Mazda MX-6, 1991-1995 Mazda MPV, 1990-1993 Mazda B2600, 1995-1999 Mazda Millenia, 1999 Mazda Protege, 1997 Honda Accord, 1999 Honda Civic, and 1989-1997 Ford Probe.
Quality Assurance
Denso manufactures this spark plug to OEM quality standards for consistent construction and service fit. The Denso 3133 is engineered for direct replacement use in listed applications, including Mazda Millenia and Mazda 626 service needs.
| Year | Make | Model | Submodel | Position | Notes |
|---|---|---|---|---|---|
| 2001 | Mazda | Millenia | — | N/A | U-Groove Conventional |
| 1999 | Honda | Civic | Value Package | N/A | U-Groove Conventional |
| 1999 | Mazda | Millenia | — | N/A | U-Groove Conventional |
| 1999 | Mazda | Protege | — | N/A | U-Groove Conventional |
| 1998 | Mazda | Millenia | — | N/A | U-Groove Conventional |
| 1997 | Ford | Probe | — | N/A | U-Groove Conventional |
| 1997 | Honda | Accord | Value Package | N/A | U-Groove Conventional |
| 1997 | Mazda | 626 | — | N/A | U-Groove Conventional |
| 1997 | Mazda | Millenia | — | N/A | U-Groove Conventional |
| 1997 | Mazda | MX-6 | — | N/A | U-Groove Conventional |
| 1996 | Ford | Probe | — | N/A | U-Groove Conventional |
| 1996 | Mazda | 626 | — | N/A | U-Groove Conventional |
| 1996 | Mazda | Millenia | — | N/A | U-Groove Conventional |
| 1996 | Mazda | MX-6 | — | N/A | U-Groove Conventional |
| 1995 | Ford | Probe | — | N/A | U-Groove Conventional |
| 1995 | Mazda | 626 | — | N/A | U-Groove Conventional |
| 1995 | Mazda | Millenia | — | N/A | U-Groove Conventional |
| 1995 | Mazda | MPV | — | N/A | U-Groove Conventional |
| 1995 | Mazda | MX-6 | — | N/A | U-Groove Conventional |
| 1994 | Ford | Probe | — | N/A | U-Groove Conventional |
| 1994 | Mazda | 626 | — | N/A | U-Groove Conventional |
| 1994 | Mazda | MPV | — | N/A | U-Groove Conventional |
| 1994 | Mazda | MX-6 | — | N/A | U-Groove Conventional |
| 1993 | Ford | Probe | — | N/A | U-Groove Conventional |
| 1993 | Mazda | 626 | — | N/A | U-Groove Conventional |
| 1993 | Mazda | B2600 | — | N/A | U-Groove Conventional |
| 1993 | Mazda | MPV | — | N/A | U-Groove Conventional |
| 1993 | Mazda | MX-6 | — | N/A | U-Groove Conventional |
| 1992 | Ford | Probe | — | N/A | U-Groove Conventional |
| 1992 | Mazda | 626 | — | N/A | U-Groove Conventional |
| 1992 | Mazda | B2600 | — | N/A | U-Groove Conventional |
| 1992 | Mazda | MPV | — | N/A | U-Groove Conventional |
| 1992 | Mazda | MX-6 | — | N/A | U-Groove Conventional |
| 1991 | Ford | Probe | — | N/A | U-Groove Conventional |
| 1991 | Mazda | 626 | — | N/A | U-Groove Conventional |
| 1991 | Mazda | B2600 | — | N/A | U-Groove Conventional |
| 1991 | Mazda | MPV | — | N/A | U-Groove Conventional |
| 1991 | Mazda | MX-6 | — | N/A | U-Groove Conventional |
| 1990 | Ford | Probe | — | N/A | U-Groove Conventional |
| 1990 | Mazda | 626 | — | N/A | U-Groove Conventional |
| 1990 | Mazda | B2600 | — | N/A | U-Groove Conventional |
| 1990 | Mazda | MX-6 | — | N/A | U-Groove Conventional |
| 1989 | Ford | Probe | — | N/A | U-Groove Conventional |
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