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Engine & running faults

Turbo failure symptoms

Turbos rarely fail without a reason. Oil supply, oil condition and blocked exhaust flow are common contributors, and replacing the turbo alone can repeat the failure.

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Symptoms drivers describe

  • A loud whistle or siren noise under acceleration
  • Loss of boost and power, sometimes limp mode
  • Blue-grey smoke from the exhaust
  • Oil consumption between services
  • Oil residue in the intake pipework or intercooler

Possible causes

  • Oil starvation from a restricted feed or missed oil changes
  • Contaminated or degraded engine oil
  • Blocked oil return causing seal leakage
  • Sticking variable-vane mechanism or a faulty actuator
  • Foreign object damage to the compressor wheel
  • A restricted DPF raising back pressure

What you can do

  • Avoid hard driving once you suspect the turbo
  • Note oil consumption and service history
  • Ask for the cause to be identified, not just the turbo replaced

How we check it in the workshop

We check boost against requested values, inspect shaft play and the intake for oil, test actuator operation and check oil supply and exhaust back pressure.

Is it safe to keep driving?

Prompt. A disintegrating turbo can send debris into the engine or the DPF.

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Related repairs

How we can help

Turbo ReplacementTurbo failure often has an underlying cause. Oil supply, restriction and boost control are checked first — otherwise the new turbo goes the same way as the old one.Read more Diesel DiagnosticsModern diesels combine high-pressure fuelling, turbocharging, exhaust gas recirculation and after-treatment. When one part of that system drifts, the symptoms usually show up somewhere else.Read more DPF DiagnosticsA DPF warning is the end of a chain of events, not the start. Finding out why the filter is loading up is the part that saves money.Read more Oil & Filter ServiceClean oil of the right specification is what keeps bearings, turbochargers and wet timing belts alive. It is the single most valuable job on the schedule.Read more

Engine & running faults

Other symptoms in this group

Car stuck in limp modeLimp mode is a protection strategy, not a fault in itself. The control unit has seen a reading it does not trust and has reduced power to keep things safe.Read more White smoke from the exhaustColour, smell and whether the smoke clears once warm are what separate normal condensation from a coolant or fuelling problem.Read more Blue smoke from the exhaustBlue smoke points at oil reaching the combustion chamber or exhaust. When it appears — start-up, overrun or under boost — narrows the cause.Read more Black smoke from a diesel exhaustBlack smoke is unburnt fuel. On a modern diesel with a DPF it usually also means extra soot heading into the filter.Read more Car losing power when acceleratingLoss of power is either a fuelling, air or protection issue. Live data under load is what separates them rather than guesswork.Read more Car cutting out while drivingIntermittent cut-outs are among the most important faults to record properly, because the evidence disappears the moment the engine restarts.Read more

Want this looked at properly?

Send us your registration and describe the symptoms — we will tell you what the next step is.

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