Fault p0093

Baileys Diesel • October 20, 2023

Fault p0093 (large leak detected)

This code refers to an internal pressure loss not a physical external fuel leak.


Most common causes...


1. Pressure relief valve on high pressure fuel rail.

2. Excessive injector backflow.

3. Piggy back style rail pressure chip adding additional fuel pressure. 

4. Air in fuel system.

5. Worn suction control valve (scv) causing high fuel pressure, is often accompanied by p0088.


Point #2 is more common with Bosch fuel systems and less common with Denso fuel systems. 


Note # replacing the pressure relief valve is not always successful as the seating surface inside the high-pressure rail can be damaged and a new valve will not fix this and is often overlooked, never assume that replacement of the pressure relief valve alone will fix the issue.

Replacement of the complete fuel rail assembly is recommended.


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I hope you enjoy reading this blog post.

Baileys Diesel Group offers free tech support from qualified mechanics and an online store for all your diesel requirements including world-class diesel injectors for unparalleled performance, delivered Australia-wide.