Codes po301 and p0531-354 all reading

#1
So my fiancé’s car has these above codes reading. It read p0302 like 3 months ago along with another, airfuel imbalance code cant remember it right this second. Anyway changed the spark plugs and isolated that that coil in #2 cylinder was the issue. Just switched them around until I figured that out. So I went and bought a new one. She fired right up perfect. Then about a month later it went again. Same codes same cylinder. This time I went and returned that one and bought the upgraded one (lifetime) I believe. Anyway just the other day cel came back on and just ran the codes again. And got those 5 codes. I am no mechanic by any stretch. Trying to figure out if I can get any help on here. Trying not to take it to a mechanic I don’t know and get ripped off. Any suggestions would be greatly appreciated. Thanks guys. Billy
 
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