What causes the 4LO light to flash in the Land Cruiser?

[SanEvangeline]

The flashing of the 4LO and engine warning lights is typically caused by a malfunction in the vehicle's speed sensor. There are various reasons why the engine warning light may illuminate in a Toyota Land Cruiser, including sensor-related issues such as faults in the coolant temperature sensor, crankshaft sensor, or oxygen sensor. Other potential causes include spark plug failure, ignition coil failure, fuel pump failure, or fuel line blockage, all of which can trigger the warning light. Additional Notes: Note 1: Excessive engine mileage can weaken spark plug performance, leading to the illumination of the pollution warning light. Excessive carbon buildup causing ignition difficulties can result in the ignition coil backfiring, leading to ignition coil failure, poor ignition, incomplete combustion, and ultimately the pollution warning light turning on. A distinctive characteristic of this issue is severe engine shaking when the ignition coil fails. Note 2: If the engine does not consistently experience severe shaking, the ignition coil can generally be ruled out as the cause. In older vehicles, mechanical wear and tear can lead to poor engine performance, resulting in ignition issues and the illumination of the pollution warning light.