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NGKPart #: 91121
NGK 91121 Spark Plug
⚙️ 2 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$20.07Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship
Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
📦Laser Iridium Spark Plug
🚗Fitment: Smart, Fortwo
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? Click here for all Spark Plug options
NGK 91121 Spark Plug
| Brand | NGK |
| Part Number | 91121 |
| Position | Laser Iridium Spark Plug |
| Resistance | 5000 |
| Ground Electrode Tip Design | Standard |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Non-removable nut |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Pre-Gap Size | .028 |
| Ground Electrode Quantity | 1 |
| Hex Size | 14 |
| Insulator Height | 51.00 |
| Manufacturer Heat Range | 7 |
| Seat Type | Flat |
| Reach | 26.5 |
| Thread Diameter | 12.00 |
| Resistor Type | Yes |
| Part Number | Ilkar7j7g |
| Stock Number | 91121 |
This part fits 2 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2017 | Smart | Fortwo | 0.9L | L3 | N/A | 0.028" gap with OE manufacturer at 30,000 mile recommended service interval.; Laser Iridium Spark Plug |
| 2016 | Smart | Fortwo | 0.9L | L3 | N/A | 0.028" gap with OE manufacturer at 30,000 mile recommended service interval.; Laser Iridium 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:
91121
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.