One problem related to emission control has been reported for the 1998 Chevrolet Astro. The most recently reported issues are listed below.
Mass airflow sensor has a short service light. This sensor began to malfunction around 52000 miles, sending a code to the obd ll system resulting in a check engine light. This is way too soon for this type of component to fail, and the component is only available through general motors dealers at a lofty price.