Best spark plugs for a 2003 Ford Focus
Spark plug listings at Advance Auto Parts
Advance Auto Parts
Autolite
Autolite Copper Resistor Spark Plug: Quick Starts & Enhanced Durability, 103
MPN 103
$4.79
Advance Auto Parts
Autolite
Autolite Copper Resistor Spark Plug: Quick Starts & Enhanced Durability, 5144
MPN 5144
$4.49
Advance Auto Parts
Autolite
Autolite Double Platinum Spark Plug: Enhanced Durability & Performance, APP103
MPN APP103
$7.49
Advance Auto Parts
Autolite
Autolite Double Platinum Spark Plug: Enhanced Durability & Performance, APP5144
MPN APP5144
$7.49
Advance Auto Parts
Autolite
Autolite Double Platinum Spark Plug: Enhanced Durability & Performance, APP5364
MPN APP5364
$7.49
Advance Auto Parts
Autolite
Autolite Platinum Spark Plug (AP103): Improved Performance & Durability
MPN AP103
$5.49
Advance Auto Parts
Autolite
Autolite Platinum Spark Plug (AP5144): Improved Performance & Durability
MPN AP5144
$5.49
Advance Auto Parts
Autolite
Autolite Platinum Spark Plug: Enhanced Durability & Performance, AP5364
MPN AP5364
$5.49
Advance Auto Parts
Autolite Iridium
Autolite Iridium Iridium Ultra Fine Wire Spark Plug: Laser Welded for Optimum Performance, AI5363
MPN AI5363
$11.49
Advance Auto Parts
Autolite Iridium
Autolite Iridium Iridium XP Fine wire Spark Plug: Improved Durability, More Focused Ignition, XP103
MPN XP103
$11.49
Advance Auto Parts
Autolite Iridium
Autolite Iridium Iridium XP Fine wire Spark Plug: Improved Durability, More Focused Ignition, XP5144
MPN XP5144
$10.49
Advance Auto Parts
Autolite Iridium
Autolite Iridium Iridium XP Fine wire Spark Plug: Improved Durability, More Focused Ignition, XP5363
MPN XP5363
$11.49
Advance Auto Parts
Autolite Iridium
Autolite Iridium Iridium XP Fine wire Spark Plug: Improved Durability, More Focused Ignition, XP5364
MPN XP5364
$11.49
Advance Auto Parts
Bosch
Bosch OE Fine Wire Double Iridium Spark Plug: High Performance & Longevity, 9616
MPN 9616
$39.99
Advance Auto Parts
Champion
Champion Copper Plus Spark Plug RS9YC - Dependable Performance & Durability, 304
MPN 304
$4.79
Advance Auto Parts
Champion
Champion Double Platinum Power Spark Plug RES11PYPB5 - Enhanced Durability & Performance, 7437
MPN 7437
$8.89
Advance Auto Parts
Champion
Champion Double Platinum Power Spark Plug RS9PYP4 - Enhanced Durability & Performance, 7304
MPN 7304
$6.99
Advance Auto Parts
Champion
Champion Iridium Spark Plug RES12WYPB4 - Maximum Performance & Longevity, 9300
MPN 9300
$10.49
Advance Auto Parts
Champion
Champion Iridium Spark Plug RES9WYPB4 - Maximum Performance & Longevity, 9901
MPN 9901
$10.49
Advance Auto Parts
Champion
Champion Platinum Power Spark Plug RS10PYC - Powerful Performance & Longevity, 3408
MPN 3408
$6.49
Advance Auto Parts
DENSO
DENSO Double Platinum Spark Plug: OE Performance, lasts 60K+ Miles, PT16VR13, 5068
MPN 5068
$11.99
Advance Auto Parts
DENSO
DENSO Iridium Power Spark Plug: Maximum Spark Energy, 0.4mm Iridium Tip, IT20, 5326
MPN 5326
$14.49
Advance Auto Parts
DENSO
DENSO Iridium Power Spark Plug: Maximum Spark Energy, 0.4mm Iridium Tip, ITV16, 5338
MPN 5338
$14.49
Advance Auto Parts
DENSO
DENSO Iridium TT Spark Plug: Ultimate Endurance and Power, 0.4mm Iridium Tip, IT20TT, 4714
MPN 4714
$13.49
Advance Auto Parts
DENSO
DENSO Iridium TT Spark Plug: Ultimate Endurance and Power, 0.4mm Iridium Tip, ITV16TT, 4718
MPN 4718
$13.49
Advance Auto Parts
E3
E3 DiamondFIRE Automotive Spark Plug: More Power & Fuel Efficiency, E3.62
MPN E3.62
$8.49
Advance Auto Parts
E3
E3 DiamondFIRE Automotive Spark Plug: More Power & Fuel Efficiency, E3.66
MPN E3.66
$8.49
Advance Auto Parts
Motorcraft
Motorcraft High-Durability Spark Plug: Reduces Misfires & Fuel Consumption, SP-478-X
MPN SP-478-X
$11.99
Advance Auto Parts
Motorcraft
Motorcraft Iridium Spark Plug: Enhanced Ignition & Fuel Efficiency, SP-492-X
MPN SP-492-X
$11.49
Advance Auto Parts
Motorcraft
Motorcraft Spark Plug: Enhanced Durability & Optimized Performance, SP-504-X
MPN SP-504-X
$8.99
Advance Auto Parts
Motorcraft
Motorcraft Spark Plug: Enhanced Durability & Optimized Performance, SP-524-X
MPN SP-524-X
$11.29
Advance Auto Parts
NGK
NGK G-Power Platinum Spark Plug (TR55-1GP): Enhanced Durability & Efficiency, 7159
MPN 7159
$8.99
Advance Auto Parts
NGK
NGK G-Power Spark Plug (TR6GP): Enhanced Durability & Fuel Efficiency, 5141
MPN 5141
$8.99
Advance Auto Parts
NGK
NGK Iridium IX Spark Plug (TR55-1IX): Enhanced Acceleration & Durability, 7316
MPN 7316
$16.99
Advance Auto Parts
NGK
NGK Iridium IX Spark Plug (TR65IX): Extreme Ignitability & Durability, 3692
MPN 3692
$14.99
Advance Auto Parts
NGK
NGK Laser Iridium Spark Plug (ITR6F13): Fine Wire Tip for Precision, 4477
MPN 4477
$23.99
Advance Auto Parts
NGK
NGK OE Series Laser Platinum Spark Plug: Fine Wire Tip, PTR5A-13, 2467
MPN 2467
$17.99
Advance Auto Parts
NGK
NGK Ruthenium HX Spark Plug (TR6AHX): High Ignitability & Durability, 92714
MPN 92714
$14.49
Advance Auto Parts
NGK
NGK V-Power Nickel Spark Plug (TR55-1): Enhanced Ignitability & Performance, 2683
MPN 2683
$5.99
Advance Auto Parts
NGK
NGK V-Power Nickel Spark Plug (TR6): Reliable Performance & Ignitability, 4177
MPN 4177
$7.49Spark plug listings on Amazon
Brand and material notes
Copper plugs are often the least expensive. Platinum and iridium listings usually last longer and cost more. Use the merchant page and your owner’s manual — this site does not assign a heat range or claim a performance gain.
Before you buy
- Confirm the engine code on the vehicle or build sticker.
- Match the OE spark-plug number when you have it.
- Check plug gap, torque, and how many plugs the engine uses.
- Treat Advance and Amazon cards as separate offers, not the same SKU.
Other eligible years
- 2004
- 2003
This site contains affiliate links. We may earn a commission if you buy through Advance Auto Parts or Amazon. Listings come from merchant catalogs for the selected year, make, and model. They are not OEM confirmation of engine, plug gap, torque, heat range, or quantity.