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      10-15-2017, 03:07 PM   #9
JuniorB
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Drives: 07 e60 525 3si and nitrous
Join Date: Mar 2016
Location: Rhode Island

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On a cheap scanner, you can watch your 02 sensors on live data. If you have a large variation, it's a good indication that it may be on its way out. Evap codes are pretty straight foward but a smoke test is the only way to tell. Also look into a bad fuel cap, it will not pressurize the system with a bad cap. I had evap codes on my truck and read that a smoke test is the only real and sure way to find it. It ended up being a nipple on the gas tank. Which required replacing the tank. Check your intake pipe after the maf to throttle body for connection. For $100 get the test.