Parts for your 2015 Mitsubishi Lancer-Fuel injectors

2015 Mitsubishi Lancer fuel injectors: what they do and how to look after them

Fuel injectors are absolutely fitted and relevant on the 2015 Mitsubishi Lancer (CJ/CF). The 2.0L 4B11 and 2.4L 4B12 petrol engines use electronically controlled multi‑point fuel injection (MPI), and the turbocharged 4B11T also runs electronic fuel injection. This is documented in Mitsubishi Motors service manuals (Engine/Fuel sections for CJ/CF), the Mitsubishi electronic parts catalogue (ASA/EPC, listing injector assemblies for these engines), and independent references such as Haynes (Lancer 2007–2017) and Autodata specifications. Some overseas Lancers had a 1.8 diesel with common‑rail injectors, but Australia and New Zealand models in 2015 are predominantly petrol with MPI.

On this Lancer, the injectors meter and atomise petrol into each intake port so the ECU can hit its air‑fuel targets for smooth idle, decent power, and low emissions. Each injector opens and closes in milliseconds, shaping a fine spray that mixes evenly with the incoming air. Good spray pattern and consistent flow between cylinders are the secret sauce for crisp throttle response and tidy fuel economy around town and on the open road.

Under normal conditions there’s no fixed replacement interval for petrol injectors, they’re designed to last many years. That said, they live a hard life. As kilometres rack up, varnish and deposits from fuel can skew flow, and O‑rings can harden. Sensible servicing for a 2015 Lancer includes quality fuel, timely fuel‑filter changes where applicable, and periodic injector cleaning (on‑car detergent cleaning or off‑car ultrasonic/bench testing) roughly every 60,000–80,000 km if drivability starts to slip. After any injector work, it’s smart to check fuel trims and misfire data with a scan tool, and to replace the upper and lower seals to prevent vacuum or fuel leaks.

• Common red flags: rough idle, hesitation, hard starts, poor economy, fuel smells, or a check‑engine light with codes like P0300–P0304, P0171, or P0201–P0204.

When replacement is needed, go for new OEM‑spec or properly flow‑matched aftermarket units. Under the bonnet, always relieve fuel pressure, work clean, and lightly lubricate new O‑rings before refitting to the rail and manifold. If one cylinder’s injector has failed and the rest are aged, replacing the full set can save repeat labour and balance flow across the engine. A quick road test and leak check afterwards keeps everything sweet.

How often should 2015 Lancer fuel injectors be cleaned?
There’s no strict schedule, but many workshops suggest inspection or cleaning if drivability changes, or around 60,000–80,000 km in harsher conditions. Good fuel and regular servicing often push that out much further.

Are the 2015 Lancer’s petrol injectors direct‑injection?
No. The common AU/NZ 2015 Lancer petrol engines (4B11/4B12) use multi‑point port fuel injection. Some overseas diesel variants use common‑rail direct injectors, which are a different system.

Should all injectors be replaced at once?
Not always. If testing shows one faulty unit on a relatively low‑kilometre car, a single replacement can be fine. On higher‑kilometre engines, a matched set helps maintain even flow and avoids repeat visits.