Anyone care to comment on
this?
"Not knowing the specs of a USA CX5 I'm not 100% certain this will apply. ( I work in the New Zealand & Australian market )
The factory ignition system has a "Ion" sensor setup. Its basically a pre O2 sensor check of combustion using the ignition coil & sparkplug. I can't remember the exact details but I remember being taught we must use genuine sparkplugs and not aftermarket plugs.
Another of my 2 cents to consider before replacing sparkplugs in any Skyactiv Mazda."
http://www.aces.edu/~parmega/efi/temp/DIY-Ion-Sensing.pdf
"1.3.1 Simple..
A method to get to know whether ignition is too early or too late, on a cycle-to-cycle
basis. No extra intrusive sensors, no engine modifications. The technology
can be applied to any internal combustion engine that is ignited by a spark plug
(or has a similar pair of electrodes installed

, independent of the engine layout
and fuel."