P0087high severityPowertrain
Fuel Rail/System Pressure - Too Low
on 2008 Audi S5 4.2L V8 · AWD
What this code means
The fuel rail pressure is lower than the PCM commanded value. Common in direct injection and diesel systems.
Symptoms
- Check Engine Light
- Loss of power
- Engine stalling
- Long crank times
- Rough idle
Common causes
- Weak fuel pump
- Clogged fuel filter
- Fuel pressure regulator failure
- Fuel line leak
- Faulty high-pressure fuel pump
Diagnostic steps
- Check fuel pressure with gauge
- Inspect fuel filter
- Test fuel pump volume
- Check for fuel leaks
- Test fuel pressure regulator
Repair notes
Replace fuel pump, filter, or pressure regulator as needed.
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