Engine Misfire: 1998 C280 W202 CEL on intermittently, misfires on Cylinder 1, 2, 3 and fault code for O2 sensor 1 bank 1 noted. Need to know order of cylinders to explore wiring and coils. Any connection between O2 sensor 1 bank 1 and the cylinders 1,2,3 ? Since problem specific to 3 cylinders and one bank - wonder if MAF is safe.

Any suggestion to fix this intermittent but repetitive problem is much appreciated