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Old 11-27-2019, 10:28 PM
Join Date: Oct 2018
Location: Atlanta
Posts: 280
Oldmactech is on a distinguished road
Gascap not sealing? Cure?

About every 300 miles 3.0 throws a CEL code that translates to bank one O2 sensor. I usually just reset it and go about my business. Other night I bought gas and after tightening the gas cap the CEL immediately went out. Hmm.

Fast forward a few weeks, same thing. CEL but I figured all I needed to do was retighten the gas cap. Nope, not this time. Next day I bought gas, re-tightened gas, CEL off again.

When I bought this thing there was black crud in the gas door area, hasnít come back after cleaning.

Gas cap and seal seem good, anything else I should look at in the fuel system?

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Old 11-28-2019, 01:53 AM
Join Date: Mar 2007
Location: Seattle, WA
Posts: 209
e39_touring is on a distinguished road
What's the exact code you're getting? The gas cap shouldn't throw an o2 code, but it will throw one of the various evap codes. As far as the crud goes, just make sure the little drain is clear, or water will back up around the cap and could seep into the gas tank.
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Old 11-29-2019, 12:01 AM
Join Date: Nov 2013
Location: Chestermere AB
Posts: 233
audiophool is on a distinguished road
Mine was throwing evap codes. I greased it and it's been fine since. O-ring is cracked and I need a new cap, but I'm cheap. As long as the grease works I'll leave it.
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