Denso 3532 Spark Plug

Denso Iridium Long Life Spark Plug 3532

Denso 3532 is an Iridium Long Life spark plug built for OE-level performance, durability, and emissions control. It uses an iridium center electrode with a platinum chip ground tip to support consistent ignition in Mazda and Toyota applications, including Mazda 3, CX-5, and MX-5 Miata fitments.

The Iridium Long Life line focuses on extended service life and stable spark delivery for modern engines that call for a fine-wire iridium plug. If you are replacing worn plugs on a Mazda 3 or Mazda CX-30, Denso 3532 provides the correct OE-style configuration for the listed applications.

Key Features

• Part number: 3532
• Iridium center electrode tip material for precise spark delivery
• Platinum chip ground electrode tip design for long service life
• 5000 ohm resistor for ignition noise suppression
• Pre-gap size: 1.1 mm
• Flat seat design with 12.00 mm thread diameter
• Reach: 26.50 mm; hex size: 14.3 mm
• OE-style construction for listed Mazda and Toyota applications

Product Details

Denso Iridium Long Life 3532 is manufactured to meet strict OE performance, durability, and emissions standards. The plug combines a copper core center electrode with an iridium tip and a nickel ground electrode core, helping maintain stable combustion characteristics in the specified engines. This part cross-references DENSO Auto Parts ZC20HPR11 for the same application.

Compatible With Mazda 3, Mazda CX-30, Mazda CX-5, Mazda MX-5 Miata, Mazda 6, Mazda CX-3, Mazda 3 Sport, Toyota Yaris, Toyota Yaris iA, and Scion iA applications listed in the fitment data. For shoppers searching for a Denso 3532 spark plug for Mazda CX-5 or a Denso 3532 iridium spark plug for Mazda 3, this OE-style replacement matches the specified engine requirements.

What It Helps Address

• Misfires caused by worn or eroded spark plug electrodes
• Hard starting from degraded ignition performance
• Rough idle from inconsistent spark delivery
• Reduced fuel efficiency linked to aging plugs
• Emissions issues related to incomplete combustion

Installation Notes

Verify engine code and model year before installation, especially on Mazda 3 and Mazda 3 Sport applications with engine type notes. Confirm the specified 1.1 mm pre-gap and use the correct torque procedure for the engine. Inspect coil boots and ignition components during service to avoid repeat misfire concerns.

Quality Assurance

Denso manufactures this spark plug to OE performance, durability, and emissions standards for the listed applications. The Iridium Long Life design is intended for modern ignition systems that require a fine-wire iridium plug with stable service characteristics.