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

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Mazda RX-7
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.
 
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Mazda RX-7
Linking images from Facebook. Hopefully this works.

## Differences between the two plugs


## The cost and part #PE5R-18-110
 
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2013 CX-5 6MT
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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