P0091moderate severityPowertrain
Fuel Pressure Regulator 1 Control Circuit Low
on 1998 Audi A8 4.2L V8 · AWD
What this code means
Low voltage in the fuel pressure regulator control circuit.
Symptoms
- Check Engine Light
- Low fuel pressure
Common causes
- Short to ground
- Faulty regulator
Diagnostic steps
- Test voltage
- Check for shorts
Repair notes
Repair or replace.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1