I think I might need a new Cat and/or O2 sensor. My 318i failed emissions twice today. After the first failure the oil was changed and the stock airbox was put back in, but it still failed. I'm going to have the mechanic look and see if the cat is bad (there has been some loud vibrations coming from it's direction for a while). My question is, what kind should I get? OEM? Aftermarket? Where should I get it from?
DIY Installation shouldn't be too hard with a bentley should it?
DIY Installation shouldn't be too hard with a bentley should it?
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