Using ScanGaugeII, what to check when getting these random codes?

Question

These do not recur, with the exception of P3406. I'll clear the code and get a new one a few days later. Some of these show as 1 single code in SGII, but then it scrolls through several.

b2915 b3b06 c0a06 c2d06 p1506 p1e08 p2b06 p2d16 p3406 p3407 p3808 u1206 u2806 u2b15 u2f08 u3e06

Answer 1

If the code do not re-occur you have a sporadic fault, which are caused by loose wire connection, unsecured terminals, especially since it show "U" codes. Check the oil fill cap, has to be secured, no broken oil dipstick