Honda Fit 2007–2008 — technical service bulletin
Bulletin SB-10-015 · NHTSA communication 10036966 · issued Mar 23, 2010
Technical service bulletin
communication type
Power Train
component
2007–2008
model years
2
vehicle entries
Official summary
Honda: mil comes on with dtc p0420 (catalyst system efficiency below threshold) is stored. Ecm/pcm misinterprets engine idle conditions, resulting in inaccurate control of the fuel and ignition. Replace catalytic converter, and update the pgm-fi software with hds. *pe
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.