Toyota Prius 2001 — technical service bulletin
Bulletin 01703 · NHTSA communication 10005244 · issued Nov 14, 2003
Technical service bulletin
communication type
Engine and Engine Cooling
component
2001
model years
1
vehicle entries
Official summary
Malfunction indicator lamp (mil) on with diagnostic trouble code (dtc) p0420 due to an electronic control module (ecm) software logic error. *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.