What is the reason for the trouble light of Regal engine?

P0 12 1 Throttle/Pedal Position Sensor/Switch Ampere Line Range/Performance Failure

It's the throttle.

Try to clean the throttle.

The engine computer includes a built-in fault self-diagnosis system, which can detect faults in the engine electronic control system. When a fault is detected, the engine computer will store the fault in the memory in the form of a fault code and light the engine fault warning light (check warning light) on the instrument cluster. At this time, the following methods can be used for inspection.

Turn ON the ignition switch (put it in the "ON" position) and do not start the engine. Observe the engine fault warning light (check warning light) on the instrument panel, which should be lit. After starting the engine, the engine fault warning light on the instrument panel should go out. If the engine fault warning light is still on, it means that the fault diagnosis system has detected the fault, or the fault diagnosis system itself is abnormal. In most cases, the failure of the electronic control system is caused by the looseness of the connecting wire joints of various sensors and actuators. When the engine fault warning light is on, the owner can check whether the wires of related components are loose after turning off the ignition switch. All kinds of wire connectors are clamped by clips. When unplugging the wire plug, do not pull the wire hard. After loosening the clamp, pull and plug the connector by hand, otherwise it will easily cause damage to the wire connector. After the above preliminary inspection, if the fault cannot be eliminated, you should go to the repair shop to use special instruments for maintenance.