Chevrolet Astro 1999 — technical service bulletin
Bulletin 161001 · NHTSA communication 627998 · issued Oct 16, 2001
Technical service bulletin
communication type
Engine and Engine Cooling
component
1999
model years
2
vehicle entries
Official summary
Brief information on vehicles exhibiting diagnostic trouble code p0420 catalyst system low efficiency bank one. *tt
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.