What does the common rail injector do?

The common rail stores fuel that’s been pressurised inside the fuel pump, before the injector sprays it into the combustion chambers. With one injector per cylinder, each injector can be adjusted to the engine’s specification and optimum firing rate.

Why can common rail injectors fail?

Common rail injectors are pretty long-lasting in general, but wear and tear from issues such as deposit build-up and incorrect installation can affect them over time. There’s also the risk of water contamination from the fuel. Any of these can shorten a part’s lifespan. 

What does the electrical diagnostic tool do?

You can use the YDT720 electrical diagnostic tool to check the resistance, inductance and insulation of solenoid-type injectors. If these checks don’t return the desired results (depending on make and model), it’s possible that there’s an electrical problem with the injector.

What is the error code for a fuel injector?

If you’re checking for an issue with the fuel injector using an OBD tool, the error code will likely show up in the range beginning P0200. Other codes in this area tend to be related to engine misfire issues – which is one of the symptoms of a faulty common rail injector.

Why do I code the injector with a BlueTech tool?

If you’re fitting a replacement common rail injector, first make a note of the new correction code. Once it’s installed, reprogramme the ECU with the new correction code. You do this so that the engine knows it needs to adjust timings for the fuel spray.


Fill up your details to hear more from our experts and get the latest updates from Delphi.

I have read and accept the <a href="https://www.delphiautoparts.com/gbr/en/terms-conditions">Terms of Use</a> and <a href="https://www.delphiautoparts.com/gbr/en/privacy-policy">Privacy Policy</a>

A mechanic holding a diagnostic tool


Discover our extensive range of OE-level diagnostic and test equipment for quicker, more accurate servicing and repairs.

Two mechanics ready to start training


Choose from our expert-led, accredited training courses to enhance your skills and prepare you for the vehicles of tomorrow.