Q: Steps to fix P0121 -EPC light comes on and off, OBDII code P0121 shows 2 times on 2001 Volkswagen Beetle

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This has been going on for several months, have not found a shop that truly understands the electronics and mechanical sides.
1. EPC light will come on and off without Check Engine light, then it will come on with the CE light.
2. I change the MAS approx. 8 months ago.
3. The airbag light is always on.
4. The coolant light stays on for approx. 5-10 minutes before going off. I have replace coolant, thermostat. Still does it.
5. Brake lights work
6. It's a 5 speed standard
7. As I drive it with more codes will be thrown, all around throttle body, throttle sensor, pedal sensor, and MAS.
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