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Hello your speed sensor is malfunctioning this is connected to your speedometer.this is usually located on the top of your transmission 10mm 0r 3/8 bolt single plug this will restore your vehicle speedometer.
The mechanic should check the speedometer because of it is malfunctioning .And also the speedometer cable . If the speedometer is worn out or destroyed then replace it but if malfunctioning and can be repaired then repair it.The speedometer cable if it is disconnected then reconnect it but if cut or destroyed replace it.The service engine light will light on because of there is a problem in the service part of the engine.
The speedometer is driven by the computer which uses the Vehicle Speed Sensor, which is located on the transmission, to determine how fast the vehicle is traveling. It is not uncommon for the VSS to go out unexpectedly, usually the check engine light will come on when it malfunctions, and the computer will lock the transmission in 2nd gear, which will allow you to limp the car in to a repair shop.
The odometer circuit drive and the speedometer are controlled by the CPU built-in the gauge assembly. The CPU receives pulses from the PCM. The pulse rate increases as the car accelerates. The frequency and duration of these input pulses are measured by the CPU.