CausesThe C1201 Toyota code is set any time that the engine control system malfunctions. Because this can be caused by any defective sensor, system or wiring issue, it’s hard to determine what the cause is without looking at the other trouble codes....
9. Press Pr-A, Pr-B and Pr-C orderly to programming the 3 programmed keys to 93C56 (or 93LC66). When "OK" displays, the programming succeed; Otherwise"ERROR" signal appears. Failure may be due to misconnection between 93C56 and the programmer, or the reverse installation or corruption...