CX-5 2.0L - P0304 P0171 - Help needed please

There is a ion feedback system from the spark plugs, take a look at:
http://nema.club/2014wsm/service highlights/books/n6w01/html/id0140g0004400.html and
http://www.mcx5.org/spark_plug_inspection_skyactiv_g_2_0_-1154.html
make sure your plugs support this, you may need to put in Mazda plugs to make sure this is not the problem... Here is some of the theory
http://bmwmotorcycletech.info/ionization-current-sensing-ignition-susbystem.pdf

You nailed it!

The car came to me after new plugs were put in by another mechanic.

I got another CX-5 to start testing/swapping parts. Started with coils, then plugs, and noticed a big difference in the plug type in the working CX-5.

Plugs are $32 a piece at the dealer!

Be careful, RockAuto lists those Bosch Double Iridiums as compatible. THEY ARE NOT!

Thanks for all the help! Hopefully this post helps someone else.
 
Linking images from Facebook. Hopefully this works.

## Differences between the two plugs
23722261_10155243541658391_122913418364442954_n.jpg


## The cost and part #PE5R-18-110
23795425_10155243543413391_7664650857168692113_n.jpg
 
The car came to me after “new plugs were put in” by another mechanic.
Hopefully the car behaves now!

You did some pretty good diagnostic work there.
It's a shame that the stupid dealer can charge a $127 "diagnostic" fee and doesn't put any actual effort into diagnosing.

You should have the G/F's dad show this thread to this other mechanic to prevent other poor soles from going down the same path!
 
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