Turbocharger
What it is
A turbocharger uses exhaust gas to spin a turbine that forces extra air into the engine, making more power from a smaller engine. It spins at very high speed and runs extremely hot.
What it does
It boosts intake pressure so the engine can burn more fuel and make more power. A failing turbo causes loss of boost, whining or whistling, blue smoke (oil burning) and overboost/underboost codes such as P0234 and P0299.
Symptoms of failure
- Overboost P0234 or underboost P0299 codes
- Noticeable loss of power / limp mode
- Loud whining or whistling that rises with boost
- Blue/grey smoke from oil leaking into the intake or exhaust
- Excessive oil consumption
Common fault codes
Which vehicles need it
Turbo petrol (EcoBoost, TSI) and most modern diesels. Oil starvation and worn seals are common failure causes.
Replacement cost
| DIY (part only) | $200–$800 |
|---|---|
| At a shop (parts + labor) | $1,200–$2,800 |
| Replacement interval | No set interval — protect it with clean oil and a cool-down; replace on failure. |
| DIY difficulty | Hard / Professional — exhaust, oil and boost plumbing; not a typical DIY job |
| Recommended brands | Garrett, BorgWarner, Mitsubishi (MHI), OEM |
Where to buy the part
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Frequently asked questions
What kills a turbocharger?
Most turbo failures come down to oil — dirty oil, oil starvation, or coking from shutting a hot engine down too quickly. Worn bearings and seals then let oil into the intake and cause smoke and lost boost.
Can I drive with a P0299 underboost code?
Usually in limp mode, but you will have little power and may be making the problem worse (e.g. a boost leak or failing turbo). Get it diagnosed before driving far.