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2005 MINI COOPER
1.6L I4•FWD•AUTOMATIC•gas•W10B16
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor499Torque3409Fluid7DTC1373Battery1Maintenance0Recalls4
P3037high severityPowertrain

Turbo Oil Supply Line Restricted

on 2005 Mini Cooper 1.6L I4 · FWD

What this code means

The oil supply line to the turbocharger is restricted, reducing oil flow for bearing lubrication and cooling. This will cause premature turbo failure.

Symptoms

  • Turbo whine or whistling changing pitch
  • Smoke from turbo area
  • Reduced turbo performance
  • Elevated turbo bearing temperature
  • Oil smell from engine bay
  • Turbo shaft play increasing

Common causes

  • Oil supply line carbon buildup
  • Oil supply banjo bolt screen clogged
  • Kinked or collapsed oil supply line
  • Incorrect oil supply gasket blocking hole
  • Sludge in oil feed gallery

Diagnostic steps

  1. Check oil flow at turbo feed line
  2. Inspect oil supply banjo bolt and screen
  3. Check oil return line for restriction
  4. Monitor turbo bearing temperature if possible
  5. Inspect turbo shaft for play

Repair notes

Clean or replace turbo oil supply line. Replace banjo bolt screen if clogged. Inspect turbo bearings for damage. Address oil sludge cause.

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