BMW 3 Series - Tech Talk For All Gen Of 3 Series
So trying to get to the bottom of my too rich codes at idle P2188. Isolated to Bank 1, read all codes all say Lambda post cat/downstream B1 S2.
Checked the voltages on INPA, B1 S1 reads all over, well over 0.9v seen it up at 0.98v, while B2 S2 seems fine but they seldom match.
Long term fuel...