P0093 Fuel System Leak Detected - Large Leak

Powertrain Severity: High Generic OBD-II

The fuel system cannot hold pressure, which suggests a large leak.

Common causes

  • Leaking fuel line or fitting
  • Leaking injector
  • Faulty pressure relief valve
  • High-pressure pump fault

Symptoms

  • Fuel smell
  • Engine shuts down or will not start
  • Limp mode

What to check

  1. Stop driving if you smell fuel
  2. Inspect high-pressure lines and fittings
  3. Check injector return quantities on diesels

Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0093, follow the service information for that make and model.