How does turbocharger failure typically manifest in engine performance?

• A. Noticeable power loss, higher exhaust gas temperatures, reduced boost, lag, and possible increased fuel consumption
• B. No change
• C. Reduced fuel consumption with better performance
• D. Engine runs smoother with no changes

Answer: (A)

Turbochargers increase the amount of air the engine can burn, boosting power and efficiency. When the turbo fails, the engine loses that extra air supply, so you don’t get the extra boost you expect. The most obvious consequence is noticeable power loss, especially under load or at higher RPM, since the engine can’t reach its designed air–fuel mix without the turbo’s boost. You’ll also feel slower throttle response because the boost system isn’t spooling up as it should, or it isn’t building boost at all, resulting in lag.

Exhaust gas temperatures tend to rise because the engine is running less efficiently with restricted air, so it can run hotter even though it’s not producing the extra power the turbo was meant to provide. And because the engine is working harder to try to deliver the same performance, fuel consumption often increases rather than decreases.

So, you’d expect a drop in power, reduced boost pressure, noticeable lag, higher exhaust gas temperatures, and sometimes higher fuel use. Choices that suggest no change, improved efficiency, or smoother operation don’t fit how a turbo failure disrupts the boosted air supply.