The codes were p0155 p0135 p0412 p0403 p0151... 3 of them were dealing with the o 2 sensors.. 1 was for the e g r valve... the other was for the secondary air injection. I know that sometimes 1 problem can pop up 3 or 4 codes I was wanting to know if anyone can help me out with this before I purchased any parts.

 

I've had an occasion where the codes popped up right after switching to a different brand of gas. In my situation, the N/A has always used Shell Platinum Premium, but one time the station was closed for maint. So I filled her with NON-ethanol 91 octane and CEL popped on with several errors. Put in a bottle of CRC 1 tank power renew and CEL went away.