Spark Plug References

[AKEP]

NGK part numbers listing (http://www.ngksparkplugs.com/pdf/StocktoPart11x17.pdf)
How to read NGK spark plug codes (http://www.ngksparkplugs.com/docs/tech/design_symbols_plugs.pdf)
Denso part number/cross reference list (http://www.denso.co.jp/ja/products/aftermarket/repair_parts/plug/cross_ref/pdf/otherlist.pdf)
Denso reference sheet/additional info (http://densoautoparts.com/catalogs/spark-plugs-ignition-wire-sets-direct-ignition-coils-passenger-car-light-truck)

K20A3 OEM part numbers
Honda 12290-PND-A01 REPLACED BY NEW PART NUMBER 9807B-5617W
Honda 12290-PND-A02 REPLACED BY NEW PART NUMBER 9807B-5615W

Denso OEM REPLACEMENT SKJ20DR-M11
NGK OEM REPLACEMENT IZFR6K-11

K20A2 OEM part numbers
Acura
98079-571BV (NGK)
98079-571CV (Denso)

NGK IFR7G-11KS
Denso SK22PR-M11S

Obviously K20A2 plugs are step colder that K20A3, so if you are looking for step colder plugs in an A3/CRV you want to run Type-S units.

If you're swapped (FROM and A3 to an A2/Z1/Z3) and are looking for step colder, these are the part numbers you need:
NGK
STOCK HEAT RANGE - BKR7EIX-11 - STOCK NUMBER 6988
1 STEP COLDER - BKR8EIX - STOCKNUMBER 2668
2 STEP COLDER - BKR9EIX - STOCKNUMBER 2669

Denso Iridium POWER
STOCK HEAT RANGE IK22
1 STEP COLDER IK24
2 STEP COLDER IK27

Denso Iridium Long Life
Stock Heat Range - SK22PR-M11 - These have .7mm electrode tip. Everything else may have a .4mm.

[Euro-Yellow-Ep3]

Sticky!

[jimmyjames]

Tony, thanks for posting this. As I mentioned on fb, we should probably expand this thread and update/combine the older spark plug reference threads.
Any takers out there to do some research?