The B1490 Code has many meanings and it is wanted to sense the specific meaning of the imperfect engine. The oxygen number 2 sensors on your car portion the oxygen in the finish to control how rich or lean the ratio of fuel and air are in the cylinders. Improving this blend means better fuel consumption and less use releases. When you see the code B1490 engine error code on your engine code reader this report will aid you. The B1490 code had a diagnostics procedure, with presentation engine trouble codes on the air conditioning display. Yet, the system was worrying and a hasty of random failures led to the expertise being quickly retired.