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Fault code P1093 means fuel pressure not reached under load. A code used by several manufacturers to indicate that the fuel supply circuit cannot keep up with demand under acceleration.

Typical symptoms

• Loss of power uphill
• Limp mode
• Hard starting when hot

Most common causes

• Clogged fuel filter
• Weak lift pump
• Injectors with excessive return flow
• Worn high-pressure pump
• Air in the circuit

How it is checked in diagnosis

• Reading requested and actual pressure under load
• Injector return-flow test
• Checking the supply pressure

Can you drive with code P1093?

Only to reach the workshop.

How MasterTuning helps

We read the real values from the ECU, not just the code: that is the difference between identifying the component responsible and replacing parts by trial and error. After the repair we clear the fault and check that it does not come back. Centres throughout Italy.

Read more: vehicle database · find an installer · what is ECU remapping

Do you have code P1093 on your car? Book a diagnosis at your nearest MasterTuning centre.

Frequently asked questions

What does fault code P1093 mean?

Code P1093 means fuel pressure not reached under load. A code used by several manufacturers to indicate that the fuel supply circuit cannot keep up with demand under acceleration.

Can you drive with fault P1093?

Only to reach the workshop.

Is clearing code P1093 enough to fix it?

No: if the cause is still present the code comes back after a few kilometres. Clearing should only be done after the repair, with the diagnostic tool.

How much does it cost to fix code P1093?

It depends on the component responsible: the diagnosis is precisely what identifies it with real measurements, avoiding unnecessary replacements that cost far more than the correct repair.