Signs of a failing turbo
- Loss of power, especially when pulling away or climbing hills, sometimes triggering limp mode.
- Unusual noise: louder whistling than before, a whining or screeching sound, grinding.
- Blue smoke from the exhaust and increased oil consumption.
- Oil in the intake hoses or in the intercooler.
- Black smoke when the turbo is no longer supplying enough air.
Before blaming the turbo
Many of these symptoms have a simpler cause: a split boost hose, a loose clip, a solenoid valve or actuator, or a pressure sensor. These are far cheaper repairs than replacing a turbo.
| Symptom | Likely turbo cause | Other likely cause |
|---|---|---|
| Power loss with no noise | Seized variable geometry | Hose, actuator, sensor |
| Whining or grinding noise | Worn bearings | Rare |
| Blue smoke, oil in hoses | Worn seals and bearings | Blocked oil return, crankcase breather |
Can you keep driving?
With a simple loss of power, yes — gently. With metallic grinding, heavy smoke or a runaway engine, no: pull over immediately.
Replacing the turbo correctly
A turbo with worn bearings or a damaged impeller wheel needs replacing. To ensure it lasts, fitting should be accompanied by an oil change using the recommended oil, new filters, cleaning or replacement of the oil feed pipe, a check of the oil return line, and cleaning of the intercooler if it contains oil.
