DENSO-IRT01-31(#5752)

This IRT01-31 spark plug is engineered for modern petrol engines and features an iridium centre electrode for a focused, stable spark. A finer electrode needs less voltage to fire, which helps combustion efficiency, fuel economy and emissions performance.

Long-life electrode materials resist wear so the gap stays stable for longer. A quality ceramic insulator and plated shell help protect against fouling, heat and corrosion.

Specifications

• Part number: IRT01-31
• Stock reference: #5752
• Electrode: Iridium
• Heat range code: 01
• Sold as: single plug
• Condition: new

Fitment and installation

Confirm the part number against your vehicle's specification or the plugs currently fitted, paying attention to thread size, reach, hex size and heat range. Fit to a cool engine, thread the plug in by hand first to avoid cross-threading and tighten to the manufacturer's torque value. Fine-wire plugs are pre-gapped, so avoid levering the electrode. Replace plugs as a full set for an even engine balance.

Keeping a spare on the shelf is a sensible move for workshops, fleet operators and home mechanics who would rather not wait on parts. Pairing this part with a general inspection of the surrounding components is good practice, as related parts often wear at a similar rate. Worn spark plugs can cause misfires, rough idle, hesitation and higher fuel consumption, so replacing them at the recommended interval keeps the engine running at its best. Store spare parts in a cool, dry place in their original packaging until they are needed. Quality replacement parts like this help keep running costs predictable and reduce the chance of an unexpected roadside breakdown. Regular maintenance with dependable replacement parts protects the value of your vehicle and helps it pass its next Warrant of Fitness or Certificate of Fitness inspection. Every part is checked against its part number before dispatch, so what arrives matches what you ordered. Use the correct spark plug socket to protect the ceramic insulator during removal and fitting. Inspecting the old plugs as they come out can reveal useful clues about engine condition, such as oil consumption or a rich mixture. Always follow the vehicle manufacturer's service schedule and fitting instructions, and have the work carried out by a qualified technician if you are not confident doing it yourself.