Parts for your 2009 Nissan Serena-Fuel injectors

2009 Nissan Serena fuel injectors — what they do and how to look after them

Fuel injectors are absolutely used on the 2009 Nissan Serena. The C25-series Serena with the MR20DE 2.0-litre petrol engine runs an electronically controlled multi‑point fuel injection system, and markets with diesel variants (where fitted) use high‑pressure common‑rail injectors. This is documented in the Nissan Serena C25 Factory Service Manual (EC section, Engine Control) and backed by Nissan FAST/parts catalog listings that specify injector assemblies for the C25 platform.

On the petrol MR20DE, the injectors spray a fine mist of fuel into each intake port, timed and metered by the ECU to match load, temperature and throttle position. Good atomisation keeps fuel economy tidy, maintains smooth idle, and helps the Serena pass emissions. For diesel variants, common‑rail piezo/solenoid injectors deliver precise, high‑pressure shots directly into the combustion chamber for efficiency and torque.

There’s no fixed replacement interval for injectors