Mazda CX-5 2014–2016 — technical service bulletin
Bulletin 01-010-16-3185 · NHTSA communication 10093127 · issued Apr 7, 2016
Technical service bulletin
communication type
Engine
component
2014–2016
model years
8
vehicle entries
Official summary
Some vehicles may experience the check engine light on with dtc p0421:00 (catalytic converter system) with-out experiencing poor engine performance or misfire (mitsubishi pcm only).this is caused by improper control logic of the pcm that may detect false error of the a/f sensor, resulting in false detection of p0421. To correct the problem, the control logic of the pcm has been changed.catalyst mon-itor function explanation the pcm monitors the oxygen storage amount proportional to catalytic converter purification characteristic. The pcm starts to monitor after recovery (fuel injection starts)
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.