multiple engine codes popped up at 1 time
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.