V-shaped engines like the V12 in the 2005 Rolls-Royce Phantom are prone to oil leaks, particularly from the valve cover gaskets and oil pan gaskets.

The complexity of a V12 engine can lead to problems with the cooling system, such as radiator or water pump failures, which can cause the engine to overheat.

With 12 cylinders, the Phantom has more ignition coils, increasing the likelihood of one or more failing, which can cause misfires and poor engine performance.

Over time, the timing chains in a V12 engine can stretch or wear out, leading to timing issues that affect engine performance and reliability.

The high number of cylinders means more fuel injectors, which can become clogged or fail, leading to rough idling, poor fuel economy, and reduced engine power.

V12 engines have complex intake manifolds that can develop gasket leaks, causing vacuum leaks and affecting engine performance.

With a high-performance engine like the V12, carbon buildup on the intake valves and combustion chambers can occur, leading to reduced efficiency and power.

The advanced engine management systems in the Phantom can suffer from sensor failures, such as MAF (Mass Air Flow) or O2 (Oxygen) sensors, impacting engine performance and emissions.

Due to the complexity and prestige of the Rolls-Royce brand, repairs and maintenance can be significantly more expensive compared to more common vehicles.

High-performance engines like the V12 in a 2009 Rolls-Royce Phantom often face oil leakage issues, particularly around the valve covers and oil pan gasket.

The complexity and power of a V12 engine generate substantial heat, putting stress on the cooling system, which can lead to radiator, water pump, or thermostat failures.

With twelve cylinders, the fuel injection system has more components that can fail, leading to misfires, poor fuel economy, and reduced performance.

Over time, the timing chain can stretch or wear out, which can lead to poor engine performance or even catastrophic engine failure if not addressed.

The V12 engine has multiple ignition coils, and failure in any of them can lead to misfires, poor acceleration, and rough idling.

The heavy and powerful V12 engine can cause engine mounts to wear out faster, leading to increased vibration and noise.

Direct-injection engines like the one in the Phantom can suffer from carbon build-up on intake valves, leading to rough idling, poor acceleration, and reduced fuel efficiency.

The complexity of the Rolls-Royce Phantom's engine management system can lead to electrical problems, including sensor failures and ECU malfunctions.

A common issue with high-performance V12 engines is oil leakage from gaskets, seals, or valve covers due to high temperatures and pressure.

The complexity of a V12 engine can lead to coolant leaks from hoses, radiators, or the water pump, causing overheating if not addressed.

V12 engines have multiple ignition coils, and failure of one or more can lead to misfires, reduced performance, and engine vibrations.

The fuel injectors in a V12 engine can become clogged or fail, leading to poor fuel economy, rough idling, and reduced power.

Over time, the timing chain or its tensioners can wear out, leading to noisy operation and potential engine timing problems if not maintained.

With 12 cylinders, the frequency of spark plug wear and the need for replacement is higher, leading to misfires and poor engine performance if neglected.

The complex valve train of a V12 engine can experience wear and tear, leading to valve noise, loss of compression, and decreased engine efficiency.

Common in older V12 engines, oil leaks can occur from valve cover gaskets, oil pan gaskets, or rear main seals.

V12 engines generate a lot of heat, and issues with the cooling system such as a failing water pump, clogged radiator, or faulty thermostat can cause overheating.

Faulty spark plugs, ignition coils, or fuel injectors can lead to misfires, especially in high-performance engines like the Rolls-Royce Phantom's V12.

Over time, the timing chain can stretch or the tensioners can fail, leading to timing issues and poor engine performance.

Clogged fuel filters, failing fuel pumps, or dirty injectors can cause fuel delivery issues, affecting engine performance.

Modern engines rely on various sensors (e.g., oxygen sensors, MAF sensors) that can fail and cause the engine to run poorly or trigger the check engine light.

Problems with the catalytic converter, exhaust manifold, or muffler can lead to poor engine performance and increased emissions.

The engine control module (ECM) can sometimes fail, leading to issues with engine management and performance.

Common in older V12 engines, oil leaks can occur from valve cover gaskets, oil pan gaskets, or rear main seals.

V12 engines generate a lot of heat, and issues with the cooling system such as a failing water pump, clogged radiator, or faulty thermostat can cause overheating.

Faulty spark plugs, ignition coils, or fuel injectors can lead to misfires, especially in high-performance engines like the Rolls-Royce Phantom's V12.

Over time, the timing chain can stretch or the tensioners can fail, leading to timing issues and poor engine performance.

Clogged fuel filters, failing fuel pumps, or dirty injectors can cause fuel delivery issues, affecting engine performance.

Modern engines rely on various sensors (e.g., oxygen sensors, MAF sensors) that can fail and cause the engine to run poorly or trigger the check engine light.

Problems with the catalytic converter, exhaust manifold, or muffler can lead to poor engine performance and increased emissions.

The engine control module (ECM) can sometimes fail, leading to issues with engine management and performance.