Mazda CX-9 2016–2018 — technical service bulletin
Bulletin 01-017-18-3518 · NHTSA communication 10145243 · issued Sep 14, 2018
Technical service bulletin
communication type
Engine
component
2016–2018
model years
3
vehicle entries
Official summary
Some customers may experience a check engine light on and DTC P0401:00 stored in memory without any drivability issues. P0401:00 - [PCM] EGR flow insufficient detected. This concern may be caused by the detection logic for the DTC is too sensitive. To eliminate this concern, the control logic of the PCM has been modified.
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.