Turbocharger Problems — Signs and What It Costs to Fix
Turbocharged engines deliver power. But turbos are expensive components that fail. Here is how to spot turbo failure before it destroys your engine and wallet.
What Is a Turbocharger?
A turbocharger uses exhaust gases to spin a turbine, which compresses incoming air and forces it into the engine. This increases power and efficiency without increasing engine size.
The downside: turbos are spinning at 150,000+ RPM and getting extremely hot (1,000°C+). This harsh environment means turbos are prone to failure, especially in older or poorly maintained cars.
Signs of Turbo Failure
Loss of Power
The car feels sluggish and takes forever to accelerate. The turbo is no longer compressing air efficiently, so the engine loses its power boost. This is often the first sign.
Blue/Gray Smoke from Exhaust
Indicates oil leaking inside the turbo and burning in the engine. A telltale sign of turbo seal failure.
Whining or Whistling Sound
A high-pitched whine from the engine bay under acceleration = turbo bearings are failing. The noise increases under load.
Oil in Air Filter
Remove the air filter and inspect it. Oil stains on the filter indicate the turbo is leaking oil into the intake. Bad sign.
Check Engine Light
The fault code will likely relate to turbo boost pressure (P0050X codes). Have it diagnosed to confirm.
Causes of Turbo Failure
- Poor maintenance: Dirty oil and infrequent servicing accelerates turbo wear
- Neglected intercooler: A clogged intercooler causes excessive heat and turbo damage
- Improper shutoff: Revving the engine immediately after starting or immediately before shutoff damages turbo bearings
- Boost leaks: Air escaping from boost hoses puts excessive load on the turbo
- Age and mileage: Turbos have finite lifespan. After 100,000 miles, failure is increasingly common
Repair Costs
Turbo replacement: £800–£1,500 (including labor). Some luxury cars cost £2,000–£3,000.
Turbo reconditioning: £400–£700. Rebuilding the turbo instead of replacing it. Cheaper but less durable.
Additional costs: If the turbo was neglected, replacing just the turbo might not be enough. Damaged bearings or blocked oil lines mean more work (£1,000–£2,000 extra).
How to Maintain a Turbo
- Service on time: Change oil and filter every 6,000–10,000 miles. Clean oil is essential for turbo longevity
- Let the engine warm up: Don't rev hard immediately after starting. Wait 30 seconds
- Let the engine cool down: Don't turn off the car immediately after hard driving. Let it idle for 30 seconds to cool the turbo
- Use quality fuel: Poor-quality fuel increases carbon deposits and turbo strain
- Check hoses and intercooler: Ensure all boost hoses are secure and intercoolers are clean
When Buying a Turbocharged Car
Check the service history: Is it consistent? Or are there gaps? Turbos need regular servicing.
Do a test drive: Listen for whining or whistling. Check that power feels responsive. Any hesitation under acceleration suggests turbo problems.
Get a mechanic inspection: Specifically ask the mechanic to check turbo condition. They can listen for bearing noise and check boost pressure.
Consider mileage: Turbocharged cars over 100,000 miles are riskier. Budget for a turbo replacement.
The Bottom Line
Turbocharged cars are fun and fuel-efficient. But turbo failure is catastrophically expensive and common in older cars with poor service histories. If you are buying an older turbocharged car, budget for turbo replacement as a future expense, or buy a naturally aspirated car instead.
Check the free MOT history before viewing any turbocharged car. The mileage record at each test helps you verify the service intervals — and consistent short intervals confirm the oil changes critical to turbo longevity.