Denso 4503 Spark Plug

Denso Platinum TT Spark Plug 4503

Denso Platinum TT 4503 is a spark plug built for precise ignition performance across a wide range of import and domestic applications. Its twin-tip layout promotes faster flame travel for more complete combustion, while the platinum center electrode and titanium-enhanced ground strap support consistent firing characteristics.

Key Features

• Twin-Tip ground electrode design for quicker flame propagation
• Platinum center electrode tip for durable ignition performance
• Titanium enhanced twin-tip ground strap with nickel core
• Copper center electrode core for efficient conductivity
• 5000 ohm resistor design for ignition noise suppression
• Pre-gapped at 1.0 mm with a flat seat design
• 14 mm thread diameter, 19.00 mm reach, 16 mm hex size

Product Details

The Platinum TT line focuses on stable spark delivery and efficient combustion in everyday driving conditions. Denso 4503 uses a twin-tip configuration that helps the flame front move through the air-fuel mixture more quickly, which is valuable in engines that rely on clean, repeatable ignition. This spark plug is a direct-fit style for many vehicles, including applications such as 2006-2015 Toyota Yaris, 2007-2014 Jeep Compass, and 2011-2014 Mazda 2. It also cross-references DENSO Auto Parts PK16TT for the same application.

With its platinum tip and copper-core construction, this plug is built to maintain consistent performance over extended service intervals. The 5000 ohm resistance helps control electrical interference, and the flat seat design supports proper sealing when installed to the correct specification. Part number 4503 is also listed across a broad range of fitments, including many Toyota Prius, Honda Accord, and Mitsubishi Lancer applications.

Common Issues This Part Addresses

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent spark output
• Misfire conditions related to degraded ignition performance
• Reduced combustion efficiency from excessive electrode wear
• Ignition noise concerns in resistor-equipped systems

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. Denso 4503 uses a 14 mm thread, 19.00 mm reach, 16 mm hex, and flat seat configuration, so matching the engine specification is essential. Follow the vehicle manufacturer’s torque specification and inspect the ignition system, coil condition, and plug wires or boots during service. For fitment confirmation, this part is listed for vehicles such as 2017-2020 Dodge Journey, 2017 Jeep Compass, and 2016 Toyota Prius C.

Quality Assurance

Denso Platinum TT spark plugs are engineered to meet the dimensional and electrical requirements listed above, with fitment coverage spanning 1984-2020 model years across many makes and models. Confirm application by year, make, model, and engine specification before ordering.