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NGK 94158 Spark Plug
NGK Laser Iridium Spark Plug for OE Fitment
NGK 94158 is a Laser Iridium High Ignitability spark plug built for OE-style service on select Infiniti and Nissan engines. It uses an iridium center electrode, platinum ground tip, and a copper core design to support reliable starting, stable ignition, and long service life.
Key Features
- Laser Iridium High Ignitability design for OE applications
- Iridium center electrode for durable spark performance
- Platinum ground electrode tip for even wear in distributorless ignition systems
- Fine-wire center electrode for consistent ignition response
- Copper core construction helps control heat
- Flat seat, M12 x 1.25 thread, 14mm hex, and 0.036 in. pre-gap
- Resistor spark plug with 5000 ohm resistance
Product Details
This NGK Laser Iridium High Ignitability spark plug is engineered to match OE requirements for vehicles that call for a high-ignitability plug. The iridium tipped center electrode is built for durability, while the platinum ground electrode tip helps promote even wear and steady spark performance. NGK 94158 also uses high-grade ceramic insulation and a copper core to help manage heat and support dependable operation under daily driving conditions. This part cross-references DILKAR7N9HG for the same application.
Compatible With 2019-2024 Nissan Altima, N/A; 2019-2024 Infiniti QX50, N/A; and 2022-2024 Infiniti QX55, N/A. It also fits 2019 Infiniti QX50, N/A with the OE high-ignitability service requirement. For buyers searching for an Infiniti QX50 spark plug, Nissan Altima spark plug, or Infiniti QX55 OE replacement, NGK 94158 is the direct service part to review.
What It Helps Address
- Hard starting caused by worn spark plug electrodes
- Misfire conditions related to weak ignition output
- Rough idle from inconsistent spark delivery
- Reduced throttle response from degraded plug performance
- Heat-related plug wear in OE ignition systems
Installation Notes and Tips
Verify the engine calls for a high-ignitability Laser Iridium plug before installation. Check the pre-gap specification, thread size, reach, seat type, and heat range against the vehicle service information. Use proper spark plug service procedures to avoid thread damage and ensure correct torque during installation. NGK 94158 is listed for select 2019-2024 Nissan Altima, 2019-2024 Infiniti QX50, and 2022-2024 Infiniti QX55 applications.
Quality Assurance
NGK states that this Laser Iridium High Ignitability spark plug is tested to high standards for quality and durability and is engineered for OE applications. The design combines iridium, platinum, ceramic insulation, and copper-core construction to support consistent service performance.
| Brand | NGK |
|---|---|
| Part Number | 94158 |
| Position | Laser Iridium High Ignitability Spark Plug |
| Resistance | 5000.0 |
| Ground Electrode Tip Design | Dual fine electrode (dfe) - high ignitability |
| Ground Configuration | J-gap |
| 11589 | Metric |
| Ground Electrode Core Material | Copper |
| Washer Included | Yes |
| Grade Type | Performance |
| Electrical Terminal Type | Non-removable nut |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Pre-Gap Size | .036 |
| Pre-Gap Size | 0.9 |
| Ground Electrode Quantity | 1 |
| Hex Size | 14mm |
| Insulator Height | 2.01 |
| Insulator Height | 51.0 |
| Manufacturer Heat Range | 7 |
| Seat Type | Flat |
| Reach | 1.122 |
| Reach | 28.5 |
| Insulator Material | Ceramic |
| Resistor Type | Yes |
| Skirt Length | 0.0 |
| Thread Size | M12 - 1.25 |
| Ground Electrode Tip Material | Platinum |
| Skirt | No |
| Center Electrode Insulator Tip Projection | 0.16 |
| Center Electrode Insulator Tip Projection | 4.0 |
| Center Electrode Design | Fine wire |
| 9745 | Crush |
This part fits 15 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2024 | INFINITI | QX50 | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2024 | INFINITI | QX55 | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2024 | Nissan | Altima | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2023 | INFINITI | QX50 | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2023 | INFINITI | QX55 | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2023 | Nissan | Altima | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2022 | INFINITI | QX50 | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2022 | INFINITI | QX55 | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2022 | Nissan | Altima | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2021 | INFINITI | QX50 | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2021 | Nissan | Altima | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2020 | INFINITI | QX50 | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2020 | Nissan | Altima | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
| 2019 | INFINITI | QX50 | 2.0L | L4 | N/A | 105,000 mi OE Mfr Recommended Service Interval; Laser Iridium High Ignitability Spark Plug |
| 2019 | Nissan | Altima | 2.0L | L4 | N/A | Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs.; Laser Iridium High Ignitability Spark Plug |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.