Honda Fit 2017–2018 — technical service bulletin
Bulletin ATI&11282023910 · NHTSA communication 10246405 · issued Nov 28, 2023
Technical service bulletin
communication type
Engine and Engine Cooling
component
2017–2018
model years
2
vehicle entries
Official summary
Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2017-2018 Fits with customer complaint of Check Engine Light (CEL) on with DTC P0420 (Catalyst System Efficiency Below Threshold) stored. To better understand the cause of this condition, AHM would like to collect specific parts from the vehicle prior to your attempting a repair of any kind.
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.