BMW 3 Series Forum - Technical Talk on the BMW E46
Just a quick one,
A friend of mine's 2000 E46 318i, M43TU, failed on emisions.
The Co2 and HC were all within spec but the Lambda was out on fast idle- cant remeber by how much.
looked for air leaks and found that the crankcase vent valve pictured here as part #1 was leaking...