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Originally Posted by joeblackx5
I am getting two error codes, p0171 and p0174 I have taken to mechanic and he says it is the cat and it needs to be replaced. can anyone help or is anyone familiar with these codes and how much it would cost to fix.
X5 in trouble.
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Check out this thread, it sounds like what you have, take off eng. cover to see if hoses have holes in them. Hopefuly that's causing the codes. Don't panic, easy fix.
http://www.xoutpost.com/x5-e53-forum/...case+vent+hose