P0089moderate severityPowertrain
Fuel Pressure Regulator 1 Performance
on 2009 Audi Q7 4.2L V8 · AWD
What this code means
The fuel pressure regulator is not maintaining the commanded fuel pressure.
Symptoms
- Check Engine Light
- Fluctuating idle
- Hesitation
- Poor fuel economy
Common causes
- Faulty fuel pressure regulator
- Vacuum line issue
- Fuel pump weak
- Restricted fuel supply
Diagnostic steps
- Monitor fuel pressure at idle and under load
- Test vacuum line to regulator
- Check fuel pump output
- Inspect fuel lines
Repair notes
Replace fuel pressure regulator.
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