broke service engine light how to repair on 1999 Chevrolet Astro

1999 chevy astro van, failed inspection due to catalydic converter and service engine light. Converter replaced have taken to 2 dealer ships to have service engine light repaired, Told they don't know how to fix, have never had one go out. Suggested change complete instrument panel at a cost of 600.00 no quarntee will correct problem. Any ideas? Any and all would be appreciated

Asked by for the 1999 Chevrolet Astro
1 answer
It's hard to understand how two GM dealerships couldn't find the problem. Take it to an independent GM specialist and get it fixed.
Here's a directory link for you:
https://repairpal.com/directory?address=37087&car_brand_names=Chevrolet