Lower Risk — Get It Checked Soon, Not Necessarily Today

• Mild whistling noise under boost, with no other symptoms — often a minor boost leak rather than turbo damage
• Slightly slower boost response than usual, without power loss or warning lights

These are worth diagnosing promptly, but continuing to drive gently in the short term is unlikely to cause immediate further damage — the risk is that whatever's causing it gets worse over time if left unaddressed.

Higher Risk — Get It Checked as Soon as Possible

• Blue or white-grey smoke from the exhaust — means oil is already getting past the seals; continuing to drive burns through your oil supply and can lead to low oil level and further engine wear
• Warning light with the vehicle in limp mode — the ECU has already restricted performance to protect the engine; driving normally isn't possible anyway, and pushing against limp mode can mask a worsening fault
• Overboost or erratic boost pressure — risks compressor wheel damage or worse if boost spikes repeatedly beyond safe limits

Stop Driving — Get It Recovered Rather Than Drive It In

• Loud metallic grinding, rattling or a sudden change in engine noise — can mean the shaft or bearings have already failed, or debris is loose inside the turbo; continuing to run the engine risks that debris entering the engine itself
• Heavy dense smoke or a sudden total loss of power — often means a catastrophic internal failure has already happened
• Visible oil leak with a low oil warning — risks starving the engine's bearings, not just the turbo's, if driving continues

In any of these cases, the cost of a tow is almost always lower than the cost of turning a turbo failure into an engine failure by continuing to drive.

Why Waiting Can Make the Repair More Expensive

A turbo failure that's caught early is often just a turbo problem. Left running, failed bearings can send metal debris downstream into the catalytic converter or DPF, oil starvation can spread to other engine components, and a simple boost leak can escalate into compressor wheel damage. The parts affected by delay are almost always more expensive than the turbo itself.

Not sure which category your symptom falls into?