P0093critical severityPowertrain
Fuel System Leak Detected - Large Leak
on 2005-2011 Audi A6 4.2L V8 · AWD
What this code means
The PCM detected a large fuel system leak based on fuel pressure drop rate.
Symptoms
- Check Engine Light
- Fuel smell
- Visible fuel leak
- Loss of power
- Hard starting
Common causes
- Cracked fuel line
- Damaged fuel rail
- Leaking injector seal
- Fuel pump seal failure
Diagnostic steps
- Visually inspect for fuel leaks
- Perform fuel pressure drop test
- Check all fuel connections
- Inspect injector seals
Repair notes
Immediately locate and repair fuel leak. Fire hazard.
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Other Powertrain codes on this vehicle
00532
Supply Voltage B+ Signal too Low
16394
Camshaft/Crankshaft Position Correlation Bank 1
16395
Camshaft Position Actuator Circuit/Open Bank 1
16486
Mass or Volume Air Flow Circuit Low Input
16487
Mass or Volume Air Flow Circuit High Input
16500
Engine Coolant Temperature Circuit Malfunction
16501
Engine Coolant Temperature Circuit Low Input
16502
Engine Coolant Temperature Circuit High Input
16514
O2 Sensor Circuit Bank 1 Sensor 1
16515
O2 Sensor Circuit Low Voltage Bank 1 Sensor 1