Denso 3518 Spark Plug

Denso Iridium Long Life Spark Plug for OE Fitment

Denso 3518 is an iridium spark plug built to OE performance, durability, and emissions standards. It is a direct-fit ignition component for select Toyota Corolla, Toyota Corolla Cross, and Lexus UX200 applications, with OE-style dimensions and electrode design for consistent combustion.

The Iridium Long Life (SIP) line focuses on stable ignition performance and extended service life through a fine-wire iridium center electrode, platinum needle ground tip, and needle-to-needle ground configuration. For drivers searching for a Toyota Corolla spark plug or Lexus UX200 spark plug replacement, Denso 3518 matches the factory-style specification used in these applications.

• Part number: 3518
• Iridium center electrode tip for precise spark delivery
• Platinum needle ground electrode tip design
• Needle-to-needle ground configuration
• 5000 ohm resistance
• Pre-gapped to 0.8 mm
• Flat seat design with 26.5 mm reach
• OE-style replacement for secondary ignition service

Product Details and Line Information

Denso’s Spark Plug - Iridium Long Life (SIP) line is engineered for factory-level ignition performance in modern engines that require accurate spark control and emissions compliance. This plug uses a copper core center electrode, nickel ground electrode core, and iridium tip to support consistent firing characteristics under everyday driving conditions. The Denso 3518 is a practical choice for routine maintenance on 2019-2023 Toyota Corolla, 2022-2023 Toyota Corolla Cross, and 2019-2022 Lexus UX200 models.

This part cross-references Denso 3518 with OE-style applications such as 90919-01297 and 90919-A1005 for the same application.

Common Issues This Spark Plug Can Address

• Rough idle caused by worn ignition electrodes
• Hard starting from degraded spark output
• Misfire codes related to spark plug wear
• Reduced fuel economy from inconsistent combustion
• Loss of throttle response from aging secondary ignition components

Installation Notes and Tips

Verify engine application before installation and confirm the plug matches the specified reach, seat type, and pre-gap. Use proper spark plug service procedures, including torque specifications from the vehicle manufacturer, to avoid thread or sealing damage. Inspect ignition coils and related secondary ignition components during replacement to help maintain consistent performance.

Quality Assurance

Denso manufactures this spark plug to meet OE performance, durability, and emissions standards for the listed applications. The 3518 is built as an OE-style replacement for drivers maintaining factory ignition specifications on Toyota Corolla, Toyota Corolla Cross, and Lexus UX200 models.