What happens when a turbocharger fails?

[ORosalie]

Several common symptoms of turbocharger failure are as follows: 1. Oil leakage. This usually occurs when the shaft seal of the turbocharger's exhaust-driven shaft is damaged, allowing engine oil to enter the fresh air intake and subsequently the engine cylinders. Upon disassembly, the shaft will be found covered with carbon deposits, which are residues from burnt oil. 2. Turbocharger issues caused by oil system problems. For example, a failed oil filter allows contaminated oil to enter the system. The turbocharger shaft, spinning at hundreds of thousands of RPM, relies on precise clearance fits for its seals, making it a highly precision component. 3. Problems caused by intake issues. For instance, a damaged air filter allows large particles to enter the air passage, damaging the impeller at high speeds. 4. Mechanical issues with the turbocharger itself. Primarily involving the pressure relief valve (also called the wastegate), which is a one-way air valve that opens when internal pressure becomes too high. If this valve fails, strong engine vibrations can be immediately felt during high RPM operation.

[LillianaDella]

The most direct symptom of a faulty car turbocharger is sluggish acceleration - stepping on the gas pedal feels like stepping on cotton. Last time I was on the highway, I clearly noticed how difficult overtaking became - the RPM went up but the speed wouldn't follow. There was also a metallic scraping sound under the hood, and the exhaust emissions appeared slightly blackened. The most frustrating part was the sudden spike in fuel consumption - where a full tank used to last 500km, now it struggles to reach 400km. A malfunctioning turbocharger can also affect engine longevity - for example, a seized turbine shaft can cause oil leaks and accelerate piston and cylinder wall wear. If these symptoms appear, never force the vehicle to keep running - it's much safer to immediately take it to a repair shop for inspection.

[StTimothy]

If the turbocharger fails, the most noticeable symptom while driving is a sudden drop in power. I experienced this once while driving a friend's performance car—the turbocharged vehicle, which usually delivers strong acceleration, felt like a naturally aspirated engine and struggled even on inclines. The issue can also lead to secondary problems: engine oil may leak through the turbocharger seals, causing blue smoke from the exhaust due to oil burning, or insufficient boost pressure may result in incomplete combustion, triggering the check engine light. On one occasion, I noticed the dashboard coolant temperature warning, and upon inspection, found it was caused by a clogged cooling line in the turbocharger. I recommend owners regularly inspect the intake system and cooling components—neglecting these minor issues can eventually lead to turbocharger failure.

[MacCarter]

Mechanics often say repairing a turbocharger is painfully expensive. Recently, my colleague's car had its turbo blades damaged by sand and dust due to long-term neglect of air filter replacement, costing nearly ten thousand to replace the entire turbocharger. Turbo failure can also cause engine overheating, and if piston rings deform, it may lead to a full engine overhaul. What's more troublesome is the chain reaction: a stuck wastegate can cause turbo overpressure, directly bursting the intercooler. The most extreme case I've seen was turbo bearing meltdown due to insufficient oil lubrication, with the entire engine compartment smoking. So, it's crucial to use full synthetic oil for maintenance and avoid cheap, low-quality products. Turbo condition should be checked every 5,000 kilometers.

[DiClayton]

Veteran drivers all know that turbochargers are most vulnerable to oil-related issues. With twenty years of driving experience, I've witnessed countless cases of turbocharger failures caused by deteriorated oil. For instance, prolonged oil change intervals lead to sludge buildup that clogs oil passages, causing the turbo bearings to grind dry and disintegrate. Or during cold winter starts, aggressive throttle input before proper bearing lubrication results in premature wear. The symptoms are unmistakable: the turbo's whistle turns hoarse during acceleration, and you won't feel boost pressure even when flooring it to 4000 RPM. Oil may also seep into the intake tract, leaving sticky residue around the exhaust tip. This is particularly prevalent in German vehicles - turbochargers designed for 100,000 km service life often fail by 50,000 km.