P0093
Fuel System Leak Detected - Large Leak
Fuel system pressure
Generic OBD-II
High
What it means
P0093 means the computer has detected a large leak in the fuel system, typically because fuel pressure drops or can't be maintained. This is one of the more serious fuel codes: a big leak can cause hard starting, stalling, or loss of power, and raw fuel escaping is a fire hazard. Because it combines a real drivability problem with a safety risk, the car should not be driven until the leak is found and repaired.
High
Can I keep driving? No — a large fuel leak is a safety hazard and can cause hard starting, stalling, or loss of power; stop driving and address it promptly.
Common symptoms
What you'll notice
- Hard starting, stalling, or no-start
- Loss of power or hesitation under load
- Strong fuel smell or a visible fuel leak
- Check-engine light on
Common causes
Most likely first
- Damaged, cracked, or leaking fuel line or fittingLikely
- Faulty fuel pressure regulator bleeding off pressureCommon
- Leaking or stuck-open fuel injectorCommon
- Failing high-pressure fuel pumpLess often
- Loose or degraded seals at the fuel railLess often
How to diagnose & fix
Work through it in order
- Stop and check for visible fuel leaks or fuel odor immediately — safety first.
- Perform a fuel pressure test to confirm the system can't hold pressure.
- Inspect fuel lines, fittings, rail, and injectors for leaks.
- Check the fuel pressure regulator and high-pressure pump.
- Repair or replace the leaking component, then verify pressure holds.
FAQ
Quick answers
Is it safe to drive with P0093?+
No — a large fuel leak is a fire and drivability risk. Have it towed or repaired before driving further.
Can I just clear P0093?+
Don't rely on clearing it; the leak is a physical fault that returns and stays a safety hazard until repaired.
Related codes
Often seen with P0093
Read & clear P0093 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX