P0089moderate severityPowertrain
Fuel Pressure Regulator 1 Performance
on 1996 Audi A6 2.8L V6 · 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.
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