DENSO Iridium TT Spark Plug 4 Pack • IXEH22TT

Suitable for Mazda MX-5 Mk4 / ND & RF 1.5 and 2.0 petrol models using the corresponding IXEH22TT / Mazda OE spark plug specification.

This pack contains four DENSO IXEH22TT Iridium TT spark plugs, providing a complete spark plug set for the four-cylinder Mazda applications listed below.

DENSO IXEH22TT forms part of the Iridium TT range and uses DENSO's fine twin-tip electrode design, combining a 0.4 mm iridium centre electrode with a 0.7 mm needle-type platinum ground electrode. The small electrode profiles reduce obstruction around the initial flame kernel and support dependable ignition and stable combustion.

IXEH22TT is particularly relevant to the Mazda SKYACTIV petrol engine family, including the Mazda MX-5 Mk4 / ND and RF. It is also used across a range of Mazda 2, Mazda 3, Mazda 6, CX-3 and CX-5 petrol applications where the corresponding plug specification is listed.

Product Specifications

• Brand: DENSO
• Product range: Iridium TT
• Part number: IXEH22TT
• DENSO secondary part number: 267700-8510
• DENSO short code: IT12
• DENSO trade / UK stock number: 4712
• Centre electrode: 0.4 mm iridium alloy
• Ground electrode: 0.7 mm needle-type platinum alloy
• DENSO heat range: 22
• Thread diameter: 12 mm
• Thread size: M12 x 1.25
• Thread reach: 26.5 mm
• Hex / spanner size: 14 mm
• Spark gap: 1.0 mm
• Projection: 2.5 mm
• Spark position: 4.0 mm
• Ground electrode height: 7.1 mm
• Terminal type: Solid SAE
• Resistor: 5 kΩ
• Installation torque: 17 Nm
• Quantity required per vehicle: 4
• Quantity supplied: 4 spark plugs

Typical Reasons for Replacement

Spark plugs are routine service components and may require replacement due to normal electrode wear, increasing service mileage or as part of scheduled ignition-system maintenance. Worn or unsuitable plugs can also contribute to symptoms such as difficult starting, an uneven idle or ignition misfire, although these symptoms can have other causes and should be diagnosed correctly.

Fitment Advice

Replace the four plugs as a complete set and ensure the cylinder-head plug threads are clean before installation. Start each plug carefully by hand to minimise the risk of cross-threading and tighten using the correct vehicle service procedure and torque specification.

The IXEH22TT is supplied with its specified plug gap. Do not alter the gap unless the relevant Mazda or DENSO service information specifically requires this for the vehicle being worked on.

For imported, modified or previously repaired cars, matching the part number or component specification on the plug being replaced is recommended.

Other Items to Consider

• Ignition coils
• Engine air filter
• Engine oil and oil filter when completing a full service

Useful Tools

• 14 mm spark plug socket
• Suitable extension and ratchet
• Torque wrench
• Compressed air or suitable cleaning equipment for the plug wells

Difficulty Guide

Moderate DIY service job. Spark plug access is relatively straightforward on the listed four-cylinder Mazda engines, but careful installation and correct tightening torque are important.

Why DENSO?

DENSO is a long-established Japanese automotive component manufacturer and ignition specialist. Its Iridium TT spark plugs use a fine 0.4 mm iridium centre electrode together with a 0.7 mm platinum twin-tip ground electrode to provide a compact spark area and dependable ignition performance. The range draws on DENSO's extensive experience in ignition and original-equipment automotive technology.

What's in the Box?

• 4 x DENSO IXEH22TT Iridium TT spark plugs

Installation Notes

Install only into a cool engine. Start the plugs by hand before tightening, avoid cross-threading and use the appropriate torque procedure. Do not over-tighten the plugs or apply additional thread treatments unless specifically required by the applicable service information.