Oil leaks can develop from gaskets, seals, or oil pan, leading to low oil levels and potential engine damage.

The timing belt can wear out or break, causing engine misfires and potentially severe damage if not replaced at recommended intervals.

Coolant leaks from the radiator, hoses, or water pump can lead to engine overheating and damage.

The turbocharger can suffer from oil contamination or bearing failure, leading to reduced performance and increased exhaust emissions.

Faulty ignition coils can cause misfires, poor fuel economy, and difficulty starting the engine.

Clogged or malfunctioning fuel injectors can lead to poor engine performance, rough idling, and increased fuel consumption.

Vacuum leaks can cause engine performance issues, including rough idling, stalling, or increased emissions.

A failing oxygen sensor can result in poor fuel economy, increased emissions, and performance issues.

A faulty mass air flow sensor can cause engine performance problems, including stalling and poor acceleration.

A malfunctioning PCV valve can lead to increased oil consumption, oil leaks, and rough idling.

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.

Common in Volvo engines, particularly around the oil filter housing, oil pan gasket, and valve cover gasket.

The B6304T4 engine is turbocharged and can suffer from turbo failure or issues like boost leaks or worn bearings.

Problems such as failing water pumps, radiators, or thermostats can lead to overheating.

If not replaced at recommended intervals, the timing belt can fail, causing severe engine damage.

The positive crankcase ventilation system can clog, leading to increased oil consumption and pressure build-up.

Misfires and rough running can occur when ignition coils fail, which is common in Volvo engines.

Can lead to poor fuel economy and engine performance issues.

Common failures include the MAF (Mass Air Flow) sensor, oxygen sensors, and camshaft position sensors.

On intake valves and combustion chambers, causing performance issues and rough idling.

Although not directly an engine problem, transmission issues can affect overall vehicle performance; common in automatic models.

Common in Volvo engines, particularly around the oil filter housing, oil pan gasket, and valve cover gasket.

The B6304T4 engine is turbocharged and can suffer from turbo failure or issues like boost leaks or worn bearings.

Problems such as failing water pumps, radiators, or thermostats can lead to overheating.

If not replaced at recommended intervals, the timing belt can fail, causing severe engine damage.

The positive crankcase ventilation system can clog, leading to increased oil consumption and pressure build-up.

Misfires and rough running can occur when ignition coils fail, which is common in Volvo engines.

Can lead to poor fuel economy and engine performance issues.

Common failures include the MAF (Mass Air Flow) sensor, oxygen sensors, and camshaft position sensors.

On intake valves and combustion chambers, causing performance issues and rough idling.

Although not directly an engine problem, transmission issues can affect overall vehicle performance; common in automatic models.

Oil leaks are common in engines over time due to wear and tear on gaskets and seals, particularly in a higher-performance engine like the B6304T4.

Since the B6304T4 is a turbocharged engine, issues with the turbocharger, such as bearing failure or oil supply problems, can occur.

The timing belt or chain can wear out, causing potential engine timing issues, which is critical for a high-performance engine.

Misfires can occur due to issues such as faulty spark plugs, ignition coils, or fuel injectors, especially in a complex engine with multiple cylinders.

High-performance engines can experience cooling system issues such as radiator or water pump failures, which can lead to overheating.

Direct injection engines like the B6304T4 can suffer from carbon buildup on intake valves, affecting performance and fuel efficiency.

Modern engines rely on numerous sensors; failures in sensors like the oxygen sensor or MAF sensor can lead to poor engine performance or fuel economy.

Fuel pump failures can lead to a lack of fuel delivery to the engine, causing stalling or poor performance.

The Positive Crankcase Ventilation (PCV) valve can clog or fail, leading to increased oil consumption and engine performance issues.

Engine mounts can wear out over time, leading to increased engine vibrations and noise.

Common in Volvo engines, particularly around the oil filter housing, oil pan gasket, and valve cover gasket.

The B6304T4 engine is turbocharged and can suffer from turbo failure or issues like boost leaks or worn bearings.

Problems such as failing water pumps, radiators, or thermostats can lead to overheating.

If not replaced at recommended intervals, the timing belt can fail, causing severe engine damage.

The positive crankcase ventilation system can clog, leading to increased oil consumption and pressure build-up.

Misfires and rough running can occur when ignition coils fail, which is common in Volvo engines.

Can lead to poor fuel economy and engine performance issues.

Common failures include the MAF (Mass Air Flow) sensor, oxygen sensors, and camshaft position sensors.

On intake valves and combustion chambers, causing performance issues and rough idling.

Although not directly an engine problem, transmission issues can affect overall vehicle performance; common in automatic models.

Common in Volvo engines, particularly around the oil filter housing, oil pan gasket, and valve cover gasket.

The B6304T4 engine is turbocharged and can suffer from turbo failure or issues like boost leaks or worn bearings.

Problems such as failing water pumps, radiators, or thermostats can lead to overheating.

If not replaced at recommended intervals, the timing belt can fail, causing severe engine damage.

The positive crankcase ventilation system can clog, leading to increased oil consumption and pressure build-up.

Misfires and rough running can occur when ignition coils fail, which is common in Volvo engines.

Can lead to poor fuel economy and engine performance issues.

Common failures include the MAF (Mass Air Flow) sensor, oxygen sensors, and camshaft position sensors.

On intake valves and combustion chambers, causing performance issues and rough idling.

Although not directly an engine problem, transmission issues can affect overall vehicle performance; common in automatic models.