P0087 — Fuel rail/system pressure too low

Likely causes

• Weak or worn high-pressure fuel pump (HPFP)
• Plugged fuel filter or restricted low-pressure supply
• Pressure regulator or injector leaking on return

Recommended checks

1. 1

   Measure rail pressure at idle and under load

2. 2

   Replace the fuel filter and inspect the lift pump

3. 3

   Test the HPFP and injectors for return leaks

Parts to replace

• Diesel fuel filter

  AmazonRockAuto

• High-pressure pump (HPFP)

  AmazonRockAuto

• Rail pressure regulator

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