I have the BD warning light also which comes on about 20-25 miles after a filter change or any time you open the filter cap. I just had the truck in the shop for 3 days becuase of a stumbling issue, which they could not find, and everything is fine. They checked all if the pressures and informed me that that lowest they could get my pressure to drop was 8psi at the VP. They told me that my light was coming on even at 14psi so the lights are pretty much useless. I plan to keep it in until I get a pressure gauge and will not worry about the light unless it stay on constently.