How do I change the electrical ignition switch on 2002 Toyota camry

SOURCE: DRIVE BELT ON 2002 TOYOTA CAMRY

If you are referring to the vehicle having a "Timing Belt", no, it does not have one.
The 2002 Camry 4 cylinder has a Timing CHAIN, and does not need to be replaced.

SOURCE: How to remove ignition cylinder from Toyota Camry 1993

Here are step-by-step instructions for the removal and re-installation of your ignition cylinder on your Toyota. Hope this sheds some light on the subject and solves your problem. Have a great day!

1. Disconnect the negative battery cable. If equipped with an air bag, wait at least 90 seconds before working on the vehicle.

1. Remove the lower steering column cover. Unfasten the ignition switch connector under the instrument panel.
2. Remove the screws which secure the upper and lower halves of the steering column cover.
3. Turn the lock cylinder to the ACC position with the ignition key.
4. Push the lock cylinder stop in with a small, round object (cotter pin, punch, etc.).

1. Withdraw the lock cylinder from the lock housing while depressing the stop tab.
2. To remove the ignition switch, unfasten its securing screws and withdraw the switch from the lock housing.

1. Align the locking cam with the hole in the ignition switch and insert the switch into the lock housing.
2. Secure the switch with its screw(s).
3. Make sure both the lock cylinder and column lock are in the ACC position. Slide the cylinder into the lock housing until the stop tab engages the hole in the lock.
4. Install the steering column covers.
5. Connect the ignition switch wiring.
6. Connect the negative battery cable.

SOURCE: 1998 toyota

There is a pin that you have to push in on the bottom of the lock cylinder housing.It is recessed in a hole.You have to turn the key to acc or on to get it to push in.Once you push it in you can pull the key and lock cylinder out.

SOURCE: FACTORY ALARM CAMRY TOYOTA 2002 WENT OFF WHEN i WAS DRIVING

If your remote is attached to the key in the ignition, it could have been bumped setting off the alarm. It is also possible for the lock button to be depressed and lock the doors, if you do not notice this and get out of the car........!

SOURCE: 2002 Toyota Camry oxygen sensor Bank 1 Sensor 2 location

go to manifold follow it till you find the downstream sensor there you go