2. Low oil level: A low oil level can cause the engine to run dry, which can lead to a loud knocking noise. This can be caused by a leak, or by burning oil.
3. Worn out bearings: Worn out bearings can cause a loud knocking noise. This can be caused by excessive wear and tear, or by a faulty installation.
4. Improperly installed spark plugs: Improperly installed spark plugs can cause a loud knocking noise. This can be caused by the plugs being too loose or too tight, or by the plugs not being seated properly.
5. Carbon deposits: Carbon deposits can build up on the pistons, valves, and cylinder walls, and can cause a loud knocking noise. This can be caused by a rich fuel mixture, or by a faulty engine temperature sensor.
6. Fuel injector failure: A fuel injector failure can cause a loud knocking noise. This can be caused by a faulty injector, or by a clogged injector.
7. Timing chain or belt failure: A timing chain or belt failure can cause a loud knocking noise. This can be caused by excessive wear and tear, or by a faulty installation.
8. Engine knock sensor failure: An engine knock sensor failure can cause a loud knocking noise. This can be caused by a faulty sensor, or by a problem with the wiring to the sensor.
If you are experiencing a loud knocking noise in your Toyota, it is important to have the vehicle inspected by a qualified mechanic as soon as possible. This noise could be a sign of a serious problem that needs to be addressed immediately.
