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Buy Fuel Injector Online

Also known as: Injector Valve, Fuel Injection Valve, Petrol Injector

OEM & aftermarket fuel injector from top brands — compare prices, check fitment, order with free delivery

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Shop 1514 fuel injector from 24 trusted brands including BOSCH, DELPHI, VALEO. Compare prices, check vehicle compatibility, and get free delivery on orders over £99.

Fuel Injector buying guide — what to know before you buy

Fuel injectors deliver precisely metered fuel into the combustion chamber or intake port. Clogged, leaking, or electrically faulty injectors cause misfires, poor economy, and rough running. Modern diesel injectors also require coding to the ECU after replacement. At CarParts247 we stock petrol and diesel fuel injectors from Bosch, Siemens/VDO, and Delphi.

Petrol vs diesel injector faults

Petrol injectors operate at lower pressures (3-5 bar port injection, up to 200 bar direct injection). Diesel common-rail injectors operate at extreme pressures (up to 2,500 bar) and are precision-machined components.

Misfire on one or more cylinders — blocked or electrically faulty injector
Rough idle and uneven running — injector flow imbalance
Diesel knock or rattle — injector not atomising fuel correctly
Fuel smell or visible leak around the injector seat
Black or white exhaust smoke — over-fuelling or incomplete combustion

Injector coding and maintenance

Diesel injectors have individual correction codes (IMA codes) that must be programmed into the ECU. Without coding, the engine may run rough, produce excess smoke, or damage the DPF.

Diesel injectors: always code the new injector to the ECU using a diagnostic tool
Replace copper injector sealing washers every time an injector is removed
Clean the injector seat thoroughly before refitting to prevent combustion gas leaks
Petrol injector cleaning additives can help prevent deposits on port-injection engines
Direct-injection engines (petrol and diesel) are more sensitive to injector fouling

Frequently Asked Questions

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Do diesel injectors need coding?

Yes. Each diesel injector has a unique correction code (IMA/C2I code) stamped on it. This must be programmed into the ECU using a diagnostic tool. Without coding, the engine runs incorrectly.

Can fuel injectors be cleaned?

Port-injection petrol injectors can often be cleaned with ultrasonic cleaning or fuel additive. Direct-injection and diesel injectors are harder to clean and may need specialist refurbishment or replacement.

How long do fuel injectors last?

Petrol injectors can last 100,000+ miles. Diesel injectors typically last 80,000-150,000 miles depending on fuel quality and maintenance. Regular fuel filter changes extend injector life.

What are the signs of a leaking injector?

Fuel smell around the engine, visible wetness at the injector seat, hard starting, and diesel knock. A leaking injector can also damage the DPF by allowing unburnt fuel into the exhaust.