Fuel Injectors
Shop OEM replacement fuel injectors for Toyota, Holden, Ford, Mitsubishi, Nissan, Hyundai and more. Every injector matched to OEM flow rate and spray pattern specifications. Use the Vehicle Part Finder to confirm the right injector for your vehicle.
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What Does a Fuel Injector Do?
The fuel injector is an electronically controlled valve that sprays a precisely metered amount of fuel into the engine's combustion chamber or intake port. The engine control unit (ECU) controls the injector opening time - known as pulse width - to deliver the exact quantity of fuel needed for the current engine load, speed, and temperature. Modern engines use sequential fuel injection where each injector fires individually in time with the cylinder's intake stroke, maximising combustion efficiency and minimising emissions. High-performance and newer diesel engines use direct injection where fuel is sprayed directly into the combustion chamber at very high pressure.
Symptoms of a Failing Fuel Injector
Injectors can fail by becoming clogged, leaking, or developing electrical faults in the solenoid. Each failure mode produces different symptoms. Common signs of a faulty injector include:
- Engine misfire on one or more cylinders
- Rough idle - particularly noticeable when the engine is warm
- Poor fuel economy - a leaking injector delivers excess fuel
- Fuel smell from the engine bay - sign of an external injector leak
- Hard starting or extended cranking
- Increased exhaust emissions or failed emissions test
- Check Engine light with injector circuit codes P0200 to P0209
A clogged injector can often be restored with professional ultrasonic cleaning. However, injectors with worn solenoids, cracked bodies, or worn O-rings require replacement.
Fitment and Technical Accuracy
Fuel injectors are highly application-specific. Flow rate, spray pattern, operating pressure, connector type, and injector length all vary between petrol and diesel engines and between makes and models. Fitting an injector with an incorrect flow rate will cause the engine to run rich or lean and can trigger fault codes or damage catalytic converters. Every injector in our range is cross-referenced against OEM part numbers for an exact match. Use the Vehicle Part Finder or filter by make and model to confirm the correct part before ordering.
Why Buy From SensorGal?
SensorGal is a 100% Australian owned family business supplying aftermarket OEM replacement fuel injectors for Toyota, Holden, Ford, Mitsubishi, Nissan, Hyundai, Kia, BMW, Mazda, Subaru, Mercedes-Benz and Suzuki. Orders placed before 12 noon are dispatched same day from our Cranbourne VIC warehouse via express post. All parts carry a 1-Year Australian warranty and our no-fuss returns policy.
Frequently Asked Questions
What does a fuel injector do?
A fuel injector is an electronically controlled valve that sprays a precisely metered amount of fuel directly into the engine intake port or combustion chamber. The ECU controls the injector opening time, known as pulse width, to deliver the exact fuel quantity needed for the current engine load, speed, and temperature. Each cylinder has its own injector and they fire in sequence with the cylinder intake stroke.
What are the symptoms of a faulty fuel injector?
Symptoms vary depending on whether the injector is clogged, leaking, or electrically failed. Common signs include engine misfire on one or more cylinders, rough idle particularly when the engine is warm, increased fuel consumption, fuel smell from the engine bay, hard starting, and a Check Engine light with injector circuit codes P0200 to P0209 or misfire codes P0300 to P0312.
Can I clean fuel injectors instead of replacing them?
Professional ultrasonic cleaning can restore flow and spray pattern on clogged injectors, and is worth attempting before replacement on high-value injectors. DIY injector cleaner additives in the fuel tank provide limited benefit and will not restore a significantly blocked injector. Injectors with cracked bodies, worn solenoids, or damaged O-rings cannot be restored by cleaning and require replacement.
How do I know which fuel injector is faulty?
An OBD2 scanner will show misfire codes for specific cylinders - for example P0301 indicates a misfire on cylinder 1. You can confirm the faulty injector by swapping it with a known good injector from another cylinder and checking if the misfire code follows the injector. A mechanic can also perform a fuel injector balance test using a scan tool to compare flow rates across all injectors.
Do I need to replace all fuel injectors at once?
Not always - if one injector has failed due to a specific cause such as contaminated fuel or a wiring fault, replacing only the faulty injector is reasonable. However if the injectors are high mileage and one has failed due to wear, the others are likely in similar condition. Replacing all injectors at the same time saves labour and reduces the risk of repeat failures on a vehicle you plan to keep long term.
Will a leaking fuel injector damage my engine?
Yes. A leaking injector that drips fuel into the cylinder when the engine is off causes fuel to wash oil from the cylinder walls, increasing wear on the piston rings and bore. A leaking injector that floods the cylinder can cause hydraulic lock - where liquid fuel prevents the piston from completing its stroke - which can bend or break connecting rods. A fuel smell from the engine bay at rest is a warning sign that should not be ignored.