Help ... Failure with Jetta 2001

How good nights a greeting from the Lagunera region, waiting for me to help me I have a jetta 01, a few days ago I suddenly turned off, I no longer wanted to go until after 30 minutes, it came back to start little and continued to go out, I already checked harnesses, I took out the follow -up sensor to clean it and it worked for a while and it turned off, if someone can help me, I would help me.