What do a red engine light and CAT light mean if both appear at same time? on 1997 Volkswagen Jetta

What do a red engine light and CAT light mean if both appear at same time? This appeared yesterday after i had driven for over two hours about town. I was returning home after parking the car for about 3 hours when i noticed the lights on the dashboard. What does it mean? Could it be a fault with the charging system?

Asked by for the 1997 Volkswagen Jetta
1 answer
have codes read and post so we can adv