My X5 will run ok for a few miles then these code's will show up on my scan tool. I found the Y-Duct that is part of the air intake hose's had large cracks in between the rib's (small ribed section of the y-duct). I tryed to seal them with a silicon that I had used when I installed a pellet stove. It does not slump & dry's flexible. I ran the car a little further this time before the code's came back. I removed the y-duct from the car this time & found 2 more small cracks in between the ribs. I have sealed with the same silicone again, & will let dry overnight.
Does anyone have any other idea's (if anything) that would set these code's. The P0171, & P0174 come up first & then within a few miles the rest of the fault code's show up.
Thanks you in advance.
Jay
replace the boot its only 30bucks. the po300 codes are misfire and is caused by your torn boot.
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