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Spark Plug (NGK) for 2015-2024 Cadillac & Ford • ATS, CT4, CTS, F-150, Mustang, XTS NEW

$ 12 .66

Product Notes

⚠️ Most jobs typically require 4 of this item.
Gap 0.036"
Iridium IX Spark Plug
NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.
Brand: NGK
Condition: New
LIFE
TIME
Lifetime Warranty Included
This part is backed by our industry-leading lifetime warranty. Shop with total confidence.
100%money-back 120-dayreturns OE-gradequality
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Specifications & Info


Attribute Value
Center Electrode Core Material Copper
Center Electrode Design Fine Wire
Center Electrode Insulator Tip Projection 0.12, 3.0
Center Electrode Projection Mid Projection
Center Electrode Tip Material Iridium
Electrical Terminal Type Non-removable Nut
Grade Type Performance
Ground Configuration J-gap
Ground Electrode Core Material Nickel
Ground Electrode Quantity 1
Ground Electrode Tip Design Taper Cut
Ground Electrode Tip Material Nickel
Hex Size 5/8" (16mm)
Insulator Height 2.07, 52.5
Insulator Material Ceramic
Manufacturer Heat Range 7
Material Grade Iridium
Part Number Ltr7aix
Pre Gap Size .032, 0.8
Reach 0.984, 25.0
Resistance 5000.0
Resistor Type Yes
Seat Type Tapered
Service Number Ltr7aix
Short Style Spark Plug No
Skirt No
Skirt Length 0.0
Stock Number 97921
Thread Diameter 0.551, 14.0
Washer Included No

Vehicle Fitment Guide

This part fits the following vehicles:

Cadillac 4 models (tapclick to expand)(tapclick to hide)
ATS 2016-2019 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL
Body Style Years Engine Attributes
Base Coupe 2016 - 2019 L4 2.0L Turbo AWD/RWD Automatic
Base Coupe 2016 - 2018 L4 2.0L Turbo AWD/RWD Manual
Base Coupe 2016 - 2017 L4 2.5L AWD/RWD Automatic & Manual
Base Sedan 2016 - 2018 L4 2.0L Turbo AWD/RWD Automatic & Manual
Base Sedan 2016 - 2017 L4 2.5L AWD/RWD Automatic & Manual
Coupe Coupe 2018 - 2019 L4 2.0L Turbo RWD Automatic
Luxury Coupe 2016 - 2019 L4 2.0L Turbo AWD/RWD Automatic
Luxury Coupe 2016 - 2018 L4 2.0L Turbo AWD/RWD Manual
Luxury Coupe 2016 - 2017 L4 2.5L AWD/RWD Automatic & Manual
Luxury Coupe 2016 V6 3.6L AWD/RWD Automatic & Manual
Luxury Sedan 2016 - 2018 L4 2.0L Turbo AWD/RWD Automatic & Manual
Luxury Sedan 2016 - 2017 L4 2.5L AWD/RWD Automatic & Manual
Luxury Sedan 2016 V6 3.6L AWD/RWD Automatic & Manual
Performance Coupe 2016 - 2017 L4 2.0L Turbo AWD/RWD Automatic & Manual
Performance Coupe 2016 - 2017 V6 3.6L AWD/RWD Automatic & Manual
Performance Sedan 2016 - 2017 L4 2.0L Turbo AWD/RWD Automatic & Manual
Performance Sedan 2016 - 2017 V6 3.6L AWD/RWD Automatic & Manual
Premium Coupe 2016 L4 2.0L Turbo AWD/RWD Automatic & Manual
Premium Coupe 2016 V6 3.6L AWD/RWD Automatic & Manual
Premium Sedan 2016 L4 2.0L Turbo AWD/RWD Automatic & Manual
Premium Sedan 2016 V6 3.6L AWD/RWD Automatic & Manual
Premium Luxury Coupe 2017 - 2019 V6 3.6L AWD/RWD Automatic
Premium Luxury Sedan 2017 - 2018 V6 3.6L AWD/RWD Automatic
Premium Performance Coupe 2017 L4 2.0L Turbo AWD/RWD Automatic & Manual
Premium Performance Coupe 2017 - 2019 V6 3.6L RWD Automatic
Premium Performance Coupe 2017 V6 3.6L AWD/RWD Automatic & Manual
Premium Performance Sedan 2017 L4 2.0L Turbo AWD/RWD Automatic & Manual
Premium Performance Sedan 2017 - 2018 V6 3.6L RWD Automatic
Premium Performance Sedan 2017 V6 3.6L AWD/RWD Automatic & Manual
Sedan Sedan 2018 L4 2.0L Turbo RWD Automatic
V Coupe 2016 - 2019 V6 3.6L Turbo RWD Automatic & Manual
V Sedan 2016 - 2018 V6 3.6L Turbo RWD Automatic & Manual
CT4 2022-2024 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL
Body Style Years Engine Attributes
Luxury Sedan 2022 - 2024 L4 2.0L Turbo AWD/RWD Automatic
Premium Luxury Sedan 2022 - 2024 L4 2.0L Turbo AWD/RWD Automatic
Premium Luxury Sedan 2022 - 2024 L4 2.7L Turbo AWD/RWD Automatic
Sport Sedan 2022 - 2024 L4 2.0L Turbo AWD/RWD Automatic
V Sedan 2022 - 2024 L4 2.7L Turbo AWD/RWD Automatic
V Blackwing Sedan 2022 - 2024 V6 3.6L Turbo RWD Automatic & Manual
CTS 2015-2019 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL
Body Style Years Engine Attributes
Base Sedan 2015 - 2019 L4 2.0L Turbo AWD/RWD Automatic
Luxury Sedan 2016 - 2019 V6 3.6L AWD/RWD Automatic
Luxury Sedan 2015 - 2019 L4 2.0L Turbo AWD/RWD Automatic
Luxury Sedan 2015 V6 3.6L FLEX AWD/RWD Automatic
Performance Sedan 2016 V6 3.6L AWD/RWD Automatic
Performance Sedan 2015 - 2016 L4 2.0L Turbo AWD/RWD Automatic
Performance Sedan 2015 V6 3.6L FLEX AWD/RWD Automatic
Premium Sedan 2016 - 2017 V6 3.6L AWD Automatic
Premium Sedan 2015 - 2016 L4 2.0L Turbo AWD/RWD Automatic
Premium Sedan 2015 - 2019 V6 3.6L RWD Automatic
Premium Sedan 2015 V6 3.6L FLEX AWD/RWD Automatic
Premium Luxury Sedan 2017 - 2019 V6 3.6L AWD/RWD Automatic
V Coupe 2015 V8 6.2L Supercharged RWD Automatic & Manual
V Sedan 2016 - 2019 V8 6.2L Supercharged RWD Automatic
Vsport Sedan 2015 - 2019 V6 3.6L Turbo RWD Automatic
Vsport Premium Sedan 2015 - 2016 V6 3.6L Turbo RWD Automatic
Vsport Premium Luxury Sedan 2017 - 2019 V6 3.6L Turbo RWD Automatic
XTS 2016-2019 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL
Body Style Years Engine Attributes
Base Sedan 2016 - 2019 V6 3.6L FWD Automatic
Livery Hearse 2016 - 2019 V6 3.6L FWD Automatic
Livery Limousine 2016 - 2019 V6 3.6L FWD Automatic
Livery Sedan 2018 - 2019 V6 3.6L FWD Automatic
Luxury Sedan 2016 - 2019 V6 3.6L AWD/FWD Automatic
Platinum Sedan 2016 - 2019 V6 3.6L AWD/FWD Automatic
Premium Sedan 2016 - 2017 V6 3.6L AWD/FWD Automatic
Premium Luxury Sedan 2017 - 2019 V6 3.6L AWD/FWD Automatic
Vsport Platinum Sedan 2016 - 2019 V6 3.6L Turbo AWD Automatic
Vsport Premium Sedan 2016 V6 3.6L Turbo AWD Automatic
Vsport Premium Luxury Sedan 2017 V6 3.6L Turbo AWD Automatic
Ford 2 models (tapclick to expand)(tapclick to hide)
F-150 2023-2024 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL
Body Style Years Engine Attributes
King Ranch Crew Cab Pickup 2023 - 2024 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo 4WD Automatic
King Ranch Crew Cab Pickup 2023 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD Automatic
King Ranch Crew Cab Pickup 2023 - 2024 V6 3.5L Turbo 4WD Automatic
King Ranch Crew Cab Pickup 2023 V6 3.5L Turbo RWD Automatic
King Ranch Crew Cab Pickup 2023 V8 5.0L FLEX RWD/4WD Automatic
Lariat Crew Cab Pickup 2023 V6 2.7L Turbo RWD/4WD Automatic
Lariat Crew Cab Pickup 2023 - 2024 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo 4WD Automatic
Lariat Crew Cab Pickup 2023 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD Automatic
Lariat Crew Cab Pickup 2023 - 2024 V6 3.5L Turbo 4WD Automatic
Lariat Crew Cab Pickup 2023 V6 3.5L Turbo RWD Automatic
Lariat Crew Cab Pickup 2023 - 2024 V8 5.0L FLEX 4WD Automatic
Lariat Crew Cab Pickup 2023 V8 5.0L FLEX RWD Automatic
Lariat Extended Cab Pickup 2023 V6 2.7L Turbo RWD/4WD Automatic
Lariat Extended Cab Pickup 2023 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD/4WD Automatic
Lariat Extended Cab Pickup 2023 V6 3.5L Turbo RWD/4WD Automatic
Lariat Extended Cab Pickup 2023 V8 5.0L FLEX RWD/4WD Automatic
Limited Crew Cab Pickup 2023 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD/4WD Automatic
Limited Crew Cab Pickup 2023 V6 3.5L Turbo RWD/4WD Automatic
Platinum Crew Cab Pickup 2023 - 2024 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo 4WD Automatic
Platinum Crew Cab Pickup 2023 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD Automatic
Platinum Crew Cab Pickup 2023 - 2024 V6 3.5L Turbo 4WD Automatic
Platinum Crew Cab Pickup 2023 V6 3.5L Turbo RWD Automatic
Platinum Crew Cab Pickup 2023 V8 5.0L FLEX RWD/4WD Automatic
Police Responder Crew Cab Pickup 2023 - 2024 V6 3.5L Turbo 4WD Automatic
Raptor Crew Cab Pickup 2023 - 2024 V6 3.5L Turbo 4WD Automatic
Raptor Crew Cab Pickup 2023 - 2024 V8 5.2L Supercharged 4WD Automatic
SSV Crew Cab Pickup 2023 - 2024 V6 3.5L Turbo RWD/4WD Automatic
SSV Crew Cab Pickup 2023 - 2024 V8 5.0L FLEX RWD/4WD Automatic
SSV Extended Cab Pickup 2023 - 2024 V6 3.5L Turbo RWD/4WD Automatic
SSV Extended Cab Pickup 2023 - 2024 V8 5.0L FLEX RWD/4WD Automatic
STX Crew Cab Pickup 2024 V6 2.7L Turbo RWD/4WD Automatic
STX Crew Cab Pickup 2024 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD/4WD Automatic
STX Crew Cab Pickup 2024 V8 5.0L FLEX RWD/4WD Automatic
STX Extended Cab Pickup 2024 V6 2.7L Turbo RWD/4WD Automatic
STX Extended Cab Pickup 2024 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD/4WD Automatic
STX Extended Cab Pickup 2024 V8 5.0L FLEX RWD/4WD Automatic
Tremor Crew Cab Pickup 2023 - 2024 V6 3.5L Turbo 4WD Automatic
Tremor Crew Cab Pickup 2023 - 2024 V8 5.0L FLEX 4WD Automatic
XL Crew Cab Pickup 2023 - 2024 V6 2.7L Turbo RWD/4WD Automatic
XL Crew Cab Pickup 2023 V6 3.3L RWD/4WD Automatic
XL Crew Cab Pickup 2023 V6 3.3L FLEX RWD/4WD Automatic
XL Crew Cab Pickup 2023 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD/4WD Automatic
XL Crew Cab Pickup 2023 - 2024 V6 3.5L Turbo RWD/4WD Automatic
XL Crew Cab Pickup 2023 - 2024 V8 5.0L RWD/4WD Automatic
XL Crew Cab Pickup 2023 - 2024 V8 5.0L FLEX RWD/4WD Automatic
XL Extended Cab Pickup 2024 V8 5.0L RWD/4WD Automatic
XL Extended Cab Pickup 2023 - 2024 V6 2.7L Turbo RWD/4WD Automatic
XL Extended Cab Pickup 2023 V6 3.3L FLEX RWD/4WD Automatic
XL Extended Cab Pickup 2023 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD/4WD Automatic
XL Extended Cab Pickup 2023 - 2024 V6 3.5L Turbo RWD/4WD Automatic
XL Extended Cab Pickup 2023 - 2024 V8 5.0L FLEX RWD/4WD Automatic
XL Standard Cab Pickup 2023 - 2024 V6 2.7L Turbo RWD/4WD Automatic
XL Standard Cab Pickup 2023 V6 3.3L RWD/4WD Automatic
XL Standard Cab Pickup 2023 V6 3.3L FLEX RWD/4WD Automatic
XL Standard Cab Pickup 2023 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD/4WD Automatic
XL Standard Cab Pickup 2023 - 2024 V6 3.5L Turbo RWD/4WD Automatic
XL Standard Cab Pickup 2023 - 2024 V8 5.0L RWD/4WD Automatic
XL Standard Cab Pickup 2023 - 2024 V8 5.0L FLEX RWD/4WD Automatic
XLT Crew Cab Pickup 2024 V8 5.0L RWD/4WD Automatic
XLT Crew Cab Pickup 2023 - 2024 V6 2.7L Turbo RWD/4WD Automatic
XLT Crew Cab Pickup 2023 V6 3.3L FLEX RWD/4WD Automatic
XLT Crew Cab Pickup 2023 - 2024 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD/4WD Automatic
XLT Crew Cab Pickup 2023 - 2024 V6 3.5L Turbo RWD/4WD Automatic
XLT Crew Cab Pickup 2023 - 2024 V8 5.0L FLEX RWD/4WD Automatic
XLT Extended Cab Pickup 2024 V8 5.0L RWD/4WD Automatic
XLT Extended Cab Pickup 2023 - 2024 V6 2.7L Turbo RWD/4WD Automatic
XLT Extended Cab Pickup 2023 V6 3.3L FLEX RWD/4WD Automatic
XLT Extended Cab Pickup 2023 - 2024 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD/4WD Automatic
XLT Extended Cab Pickup 2023 - 2024 V6 3.5L Turbo RWD/4WD Automatic
XLT Extended Cab Pickup 2023 - 2024 V8 5.0L FLEX RWD/4WD Automatic
XLT Standard Cab Pickup 2023 V6 2.7L Turbo RWD/4WD Automatic
XLT Standard Cab Pickup 2023 V6 3.3L FLEX RWD/4WD Automatic
XLT Standard Cab Pickup 2023 V6 3.5L FULL HYBRID EV-GAS (FHEV) Turbo RWD/4WD Automatic
XLT Standard Cab Pickup 2023 V6 3.5L Turbo RWD/4WD Automatic
XLT Standard Cab Pickup 2023 V8 5.0L FLEX RWD/4WD Automatic
Mustang 2019-2022 (tapclick to expand)(tapclick to hide)
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SubmodelSUB-
MODEL
Body Style Years Engine Attributes
Bullitt Coupe 2019 - 2020 V8 5.0L RWD Manual
EcoBoost Convertible 2019 - 2022 L4 2.3L Turbo RWD Automatic & Manual
EcoBoost Coupe 2019 - 2022 L4 2.3L Turbo RWD Automatic & Manual
EcoBoost Premium Convertible 2019 - 2022 L4 2.3L Turbo RWD Automatic & Manual
EcoBoost Premium Coupe 2019 - 2022 L4 2.3L Turbo RWD Automatic & Manual
GT Convertible 2019, 2021 - 2022 V8 5.0L RWD Automatic & Manual
GT Coupe 2019 - 2022 V8 5.0L RWD Automatic & Manual
GT Premium Convertible 2019 - 2022 V8 5.0L RWD Automatic & Manual
GT Premium Coupe 2019 - 2022 V8 5.0L RWD Automatic & Manual
GT V8 Convertible 2019 - 2022 V8 5.0L RWD Automatic & Manual
GT V8 Coupe 2019 - 2022 V8 5.0L RWD Automatic & Manual
Mach 1 Coupe 2021 - 2022 V8 5.0L RWD Automatic & Manual
Shelby GT350 Coupe 2019 - 2020 V8 5.2L RWD Manual
Shelby GT350R Coupe 2019 - 2020 V8 5.2L RWD Manual
Shelby GT500 Coupe 2020 - 2022 V8 5.2L Supercharged RWD Automatic Dual Clutch
Verify before ordering — please confirm your vehicle's year, make, model and sub-model specifications before placing your order. If anything is unclear, our customer service team is available to help.

Policies

Shipping Information

We offer fast, reliable shipping on all orders:

  • Ships to all countries via US Postal Service Priority Mail.
  • Most orders ship within 1 business day.
  • Delivery time: 1-4 business days after shipment.
  • International shipping available, including APO/FPO addresses.
  • Tracking information provided for all shipments.
  • Additional handling fees may apply for oversized/overweight packages.

Return Policy

We want you to be 100% satisfied with your purchase. That's why we offer:

  • 120-Day Returns - Return any part within 120 days from date of receipt.
  • Must obtain RMA (Return Merchandise Authorization) number before returning.
  • Parts must be in original condition, uninstalled, unaltered, and in original packaging.
  • Important: Electrical parts are not returnable if unsealed.
  • Please inspect parts upon arrival and notify us within 5 days of receiving incorrect or damaged parts.
  • Refunds processed after warehouse receives return and credited to original payment method.

Warranty

This part comes with a limited lifetime warranty. Warranty begins on the original purchase date.

Warranty does NOT cover:

  • Shipping costs or labor expenses.
  • Installation errors.
  • Parts used for racing.
  • Commercial vehicle parts.
NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.

Interchange Parts

Brand Part Number
NGK 97921

Fits Years: 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024

Fits Models: ATS, CT4, CTS, F-150, Mustang, XTS

Go-Parts Garage · Featured Guide

A Guide to Aftermarket Spark Plugs for the 2010-2024 Ford F-150

Keep your F-150's engine running strong by choosing the right spark plugs for your specific engine.

Read Full Guide

⚠️ Related Trouble Codes (OBD-II)

4 matching guides

If your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.

↑ A single part can trigger multiple related trouble codes. Each guide is vehicle- and code-specific.
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