When the turbocharger fails on a diesel engine, the vehicle can suddenly lose power, produce smoke, make unusual noises and, in severe cases, suffer engine damage.
A turbo failure does not always mean the engine itself is damaged, but continuing to drive with a seriously failed turbo can make the situation much worse.
At Bimmer Garage Nottingham, we provide turbo diagnostics and repair, and we collaborate with Midland Turbo for turbocharger reconditioning where appropriate.
What Happens When a Diesel Turbo Fails?
The exact symptoms depend on how the turbo has failed, but you may notice:
- Sudden loss of power
- Very poor acceleration
- Excessive turbo lag
- Loud whining or siren-like noise
- Grinding or rattling
- Blue or excessive exhaust smoke
- Increased oil consumption
- Engine warning light
- Limp-home mode
Sometimes the failure happens gradually, while in other cases the turbo can fail suddenly.
Why Does a Diesel Lose Power When the Turbo Fails?
A diesel engine relies on the turbocharger to force additional air into the engine.
If the turbo stops producing the required boost, the engine may no longer be able to produce its normal power.
The vehicle can feel extremely sluggish, particularly when accelerating or climbing hills.
However, low boost doesn't automatically mean the turbo itself has failed. A split boost hose, intercooler leak, sensor or turbo-control problem can create similar symptoms.
What Happens If the Turbo Starts Leaking Oil?
This is one of the more serious situations.
A damaged turbocharger can potentially allow engine oil into the intake system.
The diesel engine can then start burning that oil as fuel.
In severe cases, this can cause diesel engine runaway, where the engine revs uncontrollably despite the accelerator not being pressed.
This can result in severe engine damage.
If your diesel suddenly starts producing heavy smoke and revving uncontrollably, do not continue driving it. Get professional assistance as soon as possible.
Can a Failed Diesel Turbo Damage the Engine?
Yes.
A serious turbo failure can potentially:
- Allow excessive oil into the intake
- Cause turbocharger debris to enter the engine
- Contribute to major oil loss
- Cause engine damage if lubrication is lost
- Lead to engine runaway
However, not every turbo failure damages the engine.
If the vehicle is stopped promptly and the problem is properly diagnosed, the issue may be limited to the turbocharger and associated components.
Can You Drive a Diesel With a Blown Turbo?
It's generally not recommended.
You should stop driving if the vehicle develops:
- Heavy smoke
- Sudden major power loss
- Loud turbo noises
- Rapid oil consumption
- Significant oil leakage
- Unexpected engine revving
- Severe mechanical noises
Continuing to drive can potentially turn a turbocharger repair into a much more expensive engine repair.
What Causes a Diesel Turbo to Fail?
Common contributing factors include:
- Poor lubrication
- Incorrect engine oil
- Contaminated oil
- Blocked oil feed or drain
- Excessive heat
- Bearing wear
- Foreign-object damage
- Carbon contamination
- Boost-control faults
- Intake or exhaust restrictions
It's important to establish why the turbo failed before fitting another unit.
Turbo Diagnostics Before Replacement
A vehicle shouldn't automatically receive a replacement turbo simply because it has lost power.
At Bimmer Garage Nottingham, we can investigate:
- Turbocharger condition
- Boost pressure
- Boost hoses
- Intercooler
- Turbo control
- Oil supply
- Turbo oil feed and drain
- Diagnostic fault codes
- Intake system
- Related engine faults
This helps determine whether the turbo itself has failed or whether another problem is causing the symptoms.
Turbo Reconditioning With Midland Turbo
Bimmer Garage Nottingham collaborates with Midland Turbo for turbocharger reconditioning.
Where the existing turbocharger is suitable for reconditioning, we can work with Midland Turbo to have the unit professionally assessed and reconditioned.
Depending on the turbo's condition and the cause of failure, reconditioning may be an alternative to fitting a completely new turbocharger.
Diesel Turbo Repair in Nottingham
At Bimmer Garage Nottingham, we provide turbo diagnostics and repair for BMW, MINI and other vehicles where appropriate.
Our services can include:
- Turbo diagnostics
- Boost-system diagnostics
- Turbo inspection
- Turbo repair
- Turbo replacement
- Oil-system checks
- Intake-system inspection
- Engine diagnostics
For turbocharger reconditioning, we work in collaboration with Midland Turbo.
What Should You Do If Your Diesel Turbo Goes?
If your diesel suddenly loses power, starts smoking or develops a loud turbo noise, don't assume it will be safe to continue driving.
Stop using the vehicle and arrange a professional diagnosis.
Bimmer Garage Nottingham can inspect the vehicle and establish whether the problem is the turbocharger, boost system or another engine-related fault.
We collaborate with Midland Turbo for turbocharger reconditioning where appropriate.
Contact Bimmer Garage Nottingham with your vehicle registration and details of the symptoms for an accurate assessment and repair estimate.