The B6304T4 engine in the Volvo XC90 may suffer from oil leaks, particularly around the valve cover gasket, oil pan gasket, and rear main seal.

This engine's timing belt may wear out or break if not replaced at the recommended intervals, leading to potential engine damage.

The turbocharger on the B6304T4 can develop issues such as bearing wear, oil seal failure, or compressor wheel damage, causing reduced engine performance.

Problems with the radiator, water pump, or thermostat can lead to overheating, which can cause severe engine damage if not addressed promptly.

The intake manifold gasket may deteriorate over time, leading to vacuum leaks and poor engine performance.

Fuel injectors may become clogged or fail, resulting in poor fuel delivery, rough idling, and reduced fuel efficiency.

The ignition coils on this engine can fail, causing misfires, rough running, and a drop in engine power.

The EGR valve can become clogged with carbon deposits, leading to reduced engine performance and increased emissions.

Sensors such as the mass airflow sensor, oxygen sensor, and crankshaft position sensor may fail, leading to various drivability issues and check engine light warnings.

Turbocharged and supercharged engines often have more seals and gaskets that can fail, leading to oil leaks.

The added stress of both a turbocharger and supercharger can result in failures, reducing performance and efficiency.

High-pressure systems can lead to clogging or malfunctioning injectors, causing misfires or poor fuel economy.

The additional heat generated by high-pressure and turbocharged engines can stress the cooling system, leading to overheating.

High-performance engines often have more stress on the timing components, leading to potential premature wear or failure.

Direct injection engines, like the B4204TS, are prone to carbon build-up on intake valves, which can affect engine performance.

High-tech engines with numerous sensors can experience failures, leading to check engine lights and performance issues.

High-performance engines can cause more stress on the exhaust system, leading to potential failures in catalytic converters or exhaust manifolds.

Turbocharged and supercharged engines often have more seals and gaskets that can fail, leading to oil leaks.

The added stress of both a turbocharger and supercharger can result in failures, reducing performance and efficiency.

High-pressure systems can lead to clogging or malfunctioning injectors, causing misfires or poor fuel economy.

The additional heat generated by high-pressure and turbocharged engines can stress the cooling system, leading to overheating.

High-performance engines often have more stress on the timing components, leading to potential premature wear or failure.

Direct injection engines, like the B4204TS, are prone to carbon build-up on intake valves, which can affect engine performance.

High-tech engines with numerous sensors can experience failures, leading to check engine lights and performance issues.

High-performance engines can cause more stress on the exhaust system, leading to potential failures in catalytic converters or exhaust manifolds.

A common issue with turbocharged and supercharged engines, leading to rough idling, poor acceleration, and increased emissions.

The turbocharger in the B4204TS engine can wear out or fail, causing a loss of power and increased exhaust smoke.

Supercharged engines often face issues with oil leaks, especially around the turbocharger and supercharger components.

The engine may consume more oil than usual, which could indicate internal wear or failing gaskets.

Problems with the timing chain tensioner can lead to noise from the engine and potential timing chain failure.

Leaks in the cooling system, especially around the supercharger, can lead to engine overheating.

Faulty fuel injectors can cause poor fuel efficiency, increased emissions, and engine misfires.

Direct injection engines like the B4204TS can suffer from carbon build-up on intake valves, leading to reduced performance and efficiency.

Issues with the engine’s electronic control unit (ECU) or sensors can lead to unexpected engine behavior and error codes.

The supercharger may produce excessive noise if there are problems with its bearings or internal components.

A common issue with turbocharged and supercharged engines, leading to rough idling, poor acceleration, and increased emissions.

The turbocharger in the B4204TS engine can wear out or fail, causing a loss of power and increased exhaust smoke.

Supercharged engines often face issues with oil leaks, especially around the turbocharger and supercharger components.

The engine may consume more oil than usual, which could indicate internal wear or failing gaskets.

Problems with the timing chain tensioner can lead to noise from the engine and potential timing chain failure.

Leaks in the cooling system, especially around the supercharger, can lead to engine overheating.

Faulty fuel injectors can cause poor fuel efficiency, increased emissions, and engine misfires.

Direct injection engines like the B4204TS can suffer from carbon build-up on intake valves, leading to reduced performance and efficiency.

Issues with the engine’s electronic control unit (ECU) or sensors can lead to unexpected engine behavior and error codes.

The supercharger may produce excessive noise if there are problems with its bearings or internal components.

Oil leaks can occur due to worn-out seals or gaskets, or due to high engine pressure. This can lead to oil dripping onto other components and causing damage.

The turbocharger can fail due to oil starvation, contamination, or excessive heat, leading to a loss of power and performance.

The timing chain can become stretched or worn, leading to poor engine performance and potentially severe engine damage if it breaks.

Coolant leaks can occur from the radiator, hoses, water pump, or head gasket, leading to overheating and engine damage.

Fuel injectors can become clogged or fail, leading to poor fuel economy, misfires, and rough idling.

Ignition coils can fail, leading to misfires, rough running, and poor fuel economy.

A faulty Positive Crankcase Ventilation (PCV) valve can cause oil leaks, increased oil consumption, and rough idling.

Direct injection engines are prone to carbon buildup on intake valves, which can lead to poor performance, rough idling, and increased emissions.

Various sensors (e.g., oxygen sensor, MAF sensor, MAP sensor) can fail, leading to poor performance, increased emissions, and check engine light illumination.

The EGR valve can get stuck or clogged, leading to rough idling, poor performance, and increased emissions.