Toyota Highlander 2001 Owner's Manual

To reset the maintenance light, turn the ignition to the "ON" position, set the odometer to "ODO," turn the ignition off, hold the trip reset button, and turn the key back to "ON" without starting the engine.
The recommended oil type for the 2001 Toyota Highlander is 5W-30.
Check the AC fuse, ensure the AC belt is intact, verify refrigerant levels, and inspect the compressor clutch and relay.
Check the battery for charge and corrosion, ensure the starter and alternator are working, and verify the fuel pump operation.
The timing belt should be replaced every 90,000 miles or 72 months, whichever comes first.
Common causes include low coolant levels, a faulty thermostat, a clogged radiator, or a malfunctioning water pump.
Maintain proper tire pressure, replace air filters regularly, use recommended oil, and avoid aggressive driving.
The squealing noise is often caused by a worn or loose serpentine belt. Check and replace if necessary.
Open the glove compartment, remove the retaining clips, pull out the old filter, and insert the new filter.
Symptoms include delayed or rough shifting, slipping gears, unusual noises, and leaking transmission fluid.