I have them in my car....my check engine light is on too...but the code is PO421--Catalyst value bank 1/2 returned value low...I think that has more to do with the O2 sensors/catalytic converter than plugs....but you never know...it may have something to do with it...I also got a CEL with the NGK (OEM variety). I might switch out the plugs for the NGK Iridium IV...
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