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NGK 97921 Spark PlugOE Quality 60-Day Returns
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Part #: 97921

NGK 97921 Spark Plug

Iridium IX Spark Plug
⚙️ 23 vehicles fit this part
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Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$13.87Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
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*Free return shipping only qualifies if our fitment verification tool is used.
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✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
📦Iridium IX Spark Plug
🚗Fitment: Cadillac and Ford, ATS, CT4, CTS, F-150, Mustang, and XTS
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
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NGK 97921 Spark Plug
BrandNGK
Part Number97921
PositionIridium IX Spark Plug
Resistance5000.0
Ground Electrode Tip DesignTaper cut
Ground ConfigurationJ-gap
11589Metric
Ground Electrode Core MaterialNickel
Washer IncludedNo
Grade TypePerformance
Electrical Terminal TypeNon-removable nut
Center Electrode Core MaterialCopper
Center Electrode Tip MaterialIridium
Pre-Gap Size.032
Pre-Gap Size0.8
Ground Electrode Quantity1
Hex Size5/8" (16mm)
Insulator Height2.07
Insulator Height52.5
Manufacturer Heat Range7
Seat TypeTapered
Reach0.984
Reach25.0
Insulator MaterialCeramic
Resistor TypeYes
Skirt Length0.0
Thread SizeM14 - 1.25
Ground Electrode Tip MaterialNickel
SkirtNo
Center Electrode Insulator Tip Projection0.12
Center Electrode Insulator Tip Projection3.0
Center Electrode DesignFine wire
9805Mid projection

This part fits 23 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2025CadillacCT42.0LL4N/AGap 0.030"; Iridium IX Spark Plug
2024CadillacCT43.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2024FordF-1505.2LV8N/AGap 0.037"; Iridium IX Spark Plug
2023CadillacCT43.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2023FordF-1505.2LV8N/AGap 0.037"; Iridium IX Spark Plug
2022CadillacCT43.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2022FordMustang5.2LV8N/A60,000 mi (Severe) / 100,000 mi (Normal) Factory Recommended Service Interval; Iridium IX Spark Plug
2021FordMustang5.2LV8N/AGap 0.037"; Iridium IX Spark Plug
2020FordMustang5.2LV8N/AGap 0.037"; Iridium IX Spark Plug
2019CadillacATS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2019CadillacCTS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2019CadillacXTS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2019FordMustang5.2LV8N/AGap 0.037"; Iridium IX Spark Plug
2018CadillacATS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2018CadillacCTS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2018CadillacXTS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2017CadillacATS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2017CadillacCTS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2017CadillacXTS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2016CadillacATS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2016CadillacCTS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2016CadillacXTS3.6LV6N/AGap 0.036"; Iridium IX Spark Plug
2015CadillacCTS3.6LV6N/AGap 0.036"; Iridium IX 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:

97921LTR7AIX

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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