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I got a code P0302. The engine is running fine, with 35K on the odometer should I replace the spark plugs? The year 2016 ST, the warranty is out, I would hate to go to the dealer.
 

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Pull your plugs, do a compression test, replace with new plugs. Obviously make note as to whether theres any significant drops or differings in one cyl to another. It wouldnt be a bad idea to also switch ur number 1 cyl coil and number 2 cyl coil coz if ur cylinder 1 then throws a misfire code then ur coil is going bad.
 

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Keep us updated. If your comps are all within 10% of each other and they are all atleast above I'd say 150 you should be ok.
 
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