Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

Dynamic Brake Support (DBS) systems, while helpful, can sometimes malfunction or fail to activate properly, resulting in reduced braking efficiency.

With a naturally aspirated engine, there can be performance issues such as loss of power or inconsistent acceleration, especially if the engine is not properly maintained.

The varying engine brake horsepower (200-205 hp) might lead to inconsistent engine braking performance, particularly noticeable during manual and automatic transmission shifts.

A 4-cylinder engine, if not well-maintained, can experience cylinder misfires, leading to rough idling, reduced power, and increased fuel consumption.

As a 2018 model, general wear and tear could affect various engine components, requiring regular maintenance to ensure optimal performance.

Naturally aspirated engines generally have lower power output compared to turbocharged engines, which might not meet performance expectations for some drivers.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

The Dynamic Brake Support system may experience issues such as sensor malfunctions, software glitches, or calibration errors. This can result in the system not engaging properly during emergency braking situations.

The engine brake may not provide the expected deceleration force, which can be due to issues like exhaust valve problems, vacuum leaks, or control module faults.

Common in 4-cylinder engines, misfires can be caused by problems such as faulty spark plugs, ignition coils, fuel injectors, or issues with the engine control unit (ECU).

Naturally aspirated engines can develop oil leaks over time, which may originate from the valve cover gasket, oil pan gasket, or other engine seals.

The engine may overheat due to cooling system failures, such as a malfunctioning thermostat, radiator problems, or a failing water pump.

The CEL can be triggered by a range of issues, from minor sensor faults to more serious engine component failures, requiring diagnostic scans to identify the root cause.

Problems with the exhaust system, such as catalytic converter failure, exhaust manifold leaks, or muffler issues, can affect engine performance and emissions.

If the vehicle experiences a noticeable decrease in fuel efficiency, it could be due to clogged air filters, dirty fuel injectors, or issues with the fuel delivery system.

Over time, the timing chain or belt may wear out or stretch, leading to poor engine performance, misfires, or even engine damage if not addressed promptly.

Although not directly related to the engine, the transmission can affect engine performance, especially if there are issues with the automatic transmission (AT) or manual transmission (MT) clutch and gear systems.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

Common in older models like the 1993 Toyota MR2, often due to worn gaskets or seals.

The 3S engine is known for head gasket issues, which can lead to overheating and coolant leaks.

Regular maintenance is crucial for the timing belt to prevent it from snapping and causing engine damage.

Electronic fuel injection systems can develop issues with clogged or malfunctioning injectors over time.

The idle air control valve can become dirty or fail, leading to rough idling or stalling.

Over time, the valve cover gasket can degrade, leading to oil leaks and potential engine damage.

The cooling system, including the radiator and water pump, may fail, causing the engine to overheat.

Problems with the ignition coils or spark plugs can lead to misfires and poor engine performance.

Over time, seals and gaskets may wear out, causing oil to leak from the engine.

The 3S engine can sometimes suffer from head gasket issues, leading to coolant leaks and engine overheating.

The timing belt can wear out or break, which can cause significant engine damage if not replaced at recommended intervals.

Electronic fuel injectors can become clogged or fail, leading to poor engine performance or misfires.

Radiator and coolant hoses may develop leaks, and the water pump can fail, leading to engine overheating.

The valve cover gasket may deteriorate over time, resulting in oil leaks and potential engine damage.

Spark plugs can wear out, causing misfires, poor fuel economy, and difficulty starting the engine.

A failing ignition coil can lead to misfires, reduced engine power, and poor fuel efficiency.

The electronic throttle body can become dirty or fail, leading to erratic idling and reduced engine performance.

This sensor may fail, causing the engine to stall or not start.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

The Dynamic Brake Support system may fail to activate correctly, leading to reduced braking performance or failure to assist during emergency braking situations.

A misfire in one or more of the cylinders can occur due to issues such as spark plug failure, ignition coil problems, or fuel injector faults.

Overheating can arise from a malfunctioning cooling system, such as a faulty thermostat, radiator issues, or low coolant levels.

Oil leaks may occur from gaskets, seals, or the oil pan, leading to decreased engine lubrication and potential damage.

Problems with the timing chain or belt can cause the engine to run poorly, misfire, or even suffer severe damage if the timing is off.

Issues within the fuel system, such as a clogged fuel filter, failing fuel pump, or dirty fuel injectors, can lead to poor engine performance.

Leaks or blockages in the exhaust system can cause performance issues, increased emissions, or unusual noises.

Leaks in the intake manifold can lead to engine performance problems and reduced efficiency due to improper air-fuel mixture.

Malfunctions in the Engine Control Unit (ECU) or associated sensors can lead to various engine performance issues, including poor fuel economy and power loss.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

The 1MZ-FE engine is known for experiencing oil sludge buildup, which can lead to poor engine performance and potential engine damage if not addressed.

As the 1MZ-FE engine uses a timing belt, it is prone to failure if not replaced at recommended intervals, potentially causing severe engine damage.

This engine often experiences leaks from the valve cover gasket, leading to oil loss and potential engine damage if the oil level drops too low.

The oxygen sensors in this engine can fail, leading to poor fuel economy and increased emissions.

The 1MZ-FE engine can develop coolant leaks, often from the water pump or radiator, which can cause overheating if not repaired.

The knock sensors in these engines can fail, leading to engine knock and reduced performance.

The camshaft seals can leak oil, which can cause further damage if not addressed timely.

The Exhaust Gas Recirculation (EGR) valve can become clogged or fail, causing rough idling or poor engine performance.

The Mass Air Flow (MAF) sensor can fail, leading to erratic engine behavior and poor fuel efficiency.

The throttle body can become dirty or fail, causing issues with acceleration and engine idling.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

Common in older engines, often due to worn gaskets or seals.

Can be caused by a failing thermostat, clogged radiator, or malfunctioning water pump.

This can lead to coolant mixing with oil, causing engine damage.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Electronic fuel injection systems can have clogged or failing injectors, leading to poor performance.

Problems with spark plugs, ignition coils, or the distributor can cause misfires and poor engine performance.

Often a source of oil leaks in older engines.

Can cause rough idling and poor fuel economy.

Electronic systems rely on various sensors (e.g., oxygen sensor, MAF sensor) that can fail and cause engine issues.

Common in older engines, leading to exhaust leaks and reduced performance.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

The Dynamic Brake Support system may fail to activate correctly, leading to reduced braking performance or failure to assist during emergency braking situations.

A misfire in one or more of the cylinders can occur due to issues such as spark plug failure, ignition coil problems, or fuel injector faults.

Overheating can arise from a malfunctioning cooling system, such as a faulty thermostat, radiator issues, or low coolant levels.

Oil leaks may occur from gaskets, seals, or the oil pan, leading to decreased engine lubrication and potential damage.

Problems with the timing chain or belt can cause the engine to run poorly, misfire, or even suffer severe damage if the timing is off.

Issues within the fuel system, such as a clogged fuel filter, failing fuel pump, or dirty fuel injectors, can lead to poor engine performance.

Leaks or blockages in the exhaust system can cause performance issues, increased emissions, or unusual noises.

Leaks in the intake manifold can lead to engine performance problems and reduced efficiency due to improper air-fuel mixture.

Malfunctions in the Engine Control Unit (ECU) or associated sensors can lead to various engine performance issues, including poor fuel economy and power loss.

Common in older Toyota MR2 models, often due to worn-out gaskets or seals.

Can be caused by a failing water pump, clogged radiator, or malfunctioning thermostat.

Often related to dirty or malfunctioning fuel injectors or idle air control valve.

Can lead to severe engine damage if not replaced at recommended intervals.

Can cause coolant leaks, overheating, and poor engine performance.

Issues with electronic fuel injection could lead to poor fuel economy and engine misfires.

Faulty oxygen sensors or mass airflow sensors can lead to poor engine performance and increased emissions.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

Common in older models like the 1993 Toyota MR2, often due to worn gaskets or seals.

The 3S engine is known for head gasket issues, which can lead to overheating and coolant leaks.

Regular maintenance is crucial for the timing belt to prevent it from snapping and causing engine damage.

Electronic fuel injection systems can develop issues with clogged or malfunctioning injectors over time.

The idle air control valve can become dirty or fail, leading to rough idling or stalling.

Over time, the valve cover gasket can degrade, leading to oil leaks and potential engine damage.

The cooling system, including the radiator and water pump, may fail, causing the engine to overheat.

Problems with the ignition coils or spark plugs can lead to misfires and poor engine performance.

Common in older engines, often due to worn gaskets or seals.

Can be caused by a failing thermostat, clogged radiator, or malfunctioning water pump.

This can lead to coolant mixing with oil, causing engine damage.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Electronic fuel injection systems can have clogged or failing injectors, leading to poor performance.

Problems with spark plugs, ignition coils, or the distributor can cause misfires and poor engine performance.

Often a source of oil leaks in older engines.

Can cause rough idling and poor fuel economy.

Electronic systems rely on various sensors (e.g., oxygen sensor, MAF sensor) that can fail and cause engine issues.

Common in older engines, leading to exhaust leaks and reduced performance.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

Common in older engines, could be due to worn gaskets or seals.

Possible issues with the cooling system, such as a faulty thermostat or radiator.

Issues with the distributor, spark plugs, or ignition coil can cause misfires.

Problems with the electronic fuel injection system, such as clogged injectors or a faulty fuel pump.

If not replaced at recommended intervals, it can break and cause severe engine damage.

Can cause rough idling or poor fuel economy.

Can lead to coolant leaks, overheating, and loss of engine compression.

Can cause excessive engine vibration and noise.

Common in older models like the 1993 Toyota MR2, often due to worn gaskets or seals.

The 3S engine is known for head gasket issues, which can lead to overheating and coolant leaks.

Regular maintenance is crucial for the timing belt to prevent it from snapping and causing engine damage.

Electronic fuel injection systems can develop issues with clogged or malfunctioning injectors over time.

The idle air control valve can become dirty or fail, leading to rough idling or stalling.

Over time, the valve cover gasket can degrade, leading to oil leaks and potential engine damage.

The cooling system, including the radiator and water pump, may fail, causing the engine to overheat.

Problems with the ignition coils or spark plugs can lead to misfires and poor engine performance.