The system may fail to detect an impending collision or may not apply brakes effectively, leading to reduced braking assistance.

The L15B7 engine may produce more noise than usual due to issues like worn-out engine components or improper lubrication.

This is a common problem with turbocharged engines where fuel mixes with engine oil, reducing its lubricating properties and leading to increased wear.

The turbocharger in the L15B7 engine might experience issues such as oil leaks, bearing failure, or turbine damage, affecting engine performance.

Faulty or clogged fuel injectors can lead to poor engine performance, reduced fuel efficiency, and increased emissions.

This can be caused by issues such as faulty spark plugs, ignition coils, or fuel delivery problems, leading to poor engine performance and increased emissions.

Problems such as radiator leaks, thermostat failure, or water pump issues can lead to engine overheating, which can cause significant engine damage if not addressed.

Direct injection engines like the L15B7 are prone to carbon buildup on intake valves, which can lead to reduced engine performance and efficiency.

A faulty timing chain tensioner can cause timing chain noise and, if not addressed, can lead to severe engine damage.

Malfunctioning EGR valves can lead to rough idling, reduced fuel efficiency, and increased emissions.

Faulty sensors, such as the mass airflow sensor or oxygen sensor, can lead to incorrect air-fuel mixture, poor engine performance, and increased emissions.

Dynamic Brake Support (DBS) systems can sometimes fail to engage properly, leading to reduced braking assistance during critical moments.

Misfiring can occur in a 4-cylinder engine due to issues with spark plugs, ignition coils, or fuel injectors.

Given the vehicle's adherence to strict emissions standards (Tier 3 BIN 30 LEV3 SULEV30), any malfunction in the emissions control system can trigger warning lights and affect performance.

If the engine is equipped with a turbocharger, it may suffer from problems like turbo lag, boost leaks, or turbo failure, particularly if not well maintained.

Issues such as a clogged fuel filter, failing fuel pump, or dirty fuel injectors can affect engine performance and fuel economy.

Problems with the radiator, thermostat, or water pump can lead to engine overheating, potentially causing severe damage.

Over time, the timing belt or chain can wear out, leading to noisy operation or even catastrophic engine failure if it breaks.

Some Volkswagen engines are known for higher-than-normal oil consumption, which can lead to frequent top-ups and potential engine damage if not monitored.

Modern vehicles are highly dependent on electronics, and problems with sensors, wiring, or control modules can lead to various engine performance issues.

Although not directly related to the engine, transmission issues like slipping, hard shifts, or failure to engage can impact overall vehicle performance and drivability.

Occasionally, the engine control unit (ECU) may require software updates to fix bugs or improve performance, which can be a common issue in modern vehicles.