Parts for your 2005 Toyota Highlander-Fuel injectors

2005 Toyota Highlander (Kluger) Fuel Injectors

Fuel injectors are absolutely relevant and fitted to the 2005 Toyota Highlander (known as Kluger in Australia and New Zealand). Both available petrol engines for that model year—the 2.4‑litre 2AZ‑FE inline‑four and the 3.3‑litre 3MZ‑FE V6—use electronically controlled, sequential multi‑port fuel injection. This is documented in Toyota’s factory service information for the Engine Control (SFI) system and reflected in Toyota’s Electronic Parts Catalogue, which lists an “Injector Assembly, Fuel” for these engines, as well as in Toyota’s EFI wiring diagrams for the model.

On this Highlander, each cylinder gets its own injector. The engine control unit (ECU) pulses the injector to deliver a precise mist of petrol straight into the intake port, timed to suit load, temperature and throttle position. The upshot is tidy cold starts, smooth idle, better fuel economy and reduced emissions compared with old‑school carburettors.

Over time, varnish and deposits from fuel can affect flow and spray pattern. That can show up as a rough idle, hesitation on take‑off or a spike in fuel use. Because the 2005 Highlander runs OBD‑II, the ECU will often log faults such as cylinder misfire (P030x), lean/rich codes (P0171/P0172) or injector circuit faults if something’s really off.

• Common signs of injector issues: hard starting, rough idle, pinging under load, poor economy, fuel smell, or fuel trims wandering on a scan tool.
• Good practice: use quality petrol, replace the fuel filter as specified (where fitted), and consider periodic professional cleaning if symptoms appear.

There’s no fixed replacement interval for injectors, Toyota treats them as “inspect and service as needed”. During routine servicing, it’s smart to check for vacuum leaks, monitor long‑ and short‑term fuel trims, and run an injector balance test if drivability isn’t perfect. If an injector needs to come out, always fit new upper and lower O‑rings/insulators and lightly lubricate the seals before refit. On the V6, plan for extra time as the upper intake plenum may need removal, replace any disturbed gaskets. After reassembly, cycle the key to prime the rail, check meticulously for leaks and verify trims and idle quality. No special coding is normally required for OE‑spec Denso injectors on this model.

• When replacing, stick with quality OE or OE‑equivalent injectors, renew seals, follow the factory torque specs for fuel rail and manifold fasteners, and confirm repairs with a scan and road test.

Popular questions about 2005 Toyota Highlander fuel injectors

Are fuel injectors fitted to the 2005 Highlander/Kluger?
Yes. Both the 2AZ‑FE (2.4‑litre) and 3MZ‑FE (3.3‑litre) petrol engines use sequential multi‑port fuel injectors controlled by the ECU. This is outlined in Toyota’s SFI/EFI service information and parts listings for the model year.

How often should injectors be serviced or replaced?
There’s no set replacement interval. If the vehicle runs well and trims are tidy, they’re left alone. Service or replace injectors when there are drivability symptoms, relevant fault codes, or poor balance test results. Whenever injectors are removed, replace O‑rings and insulators.

What’s the best way to keep injectors healthy?
Use quality fuel, keep up with regular servicing, and fix intake or vacuum leaks promptly. If rough running develops, a professional on‑car clean or bench test/ultrasonic clean can restore flow and spray pattern. Always check for leaks after any injector work.