Hey helpful SLK owners, After happily driving my 2001, SLK. 320 for three months, I received my first CIL, PO 130 & PO 150, L/R pre Cat O2 sensors. When I cleaned the MAF sensor, I discover the air box below the sensor was loose below the sensor & where it goes into the manifold. How do you tighten the bottom "boot"? I don't know what this part is called. It's like a rubber or plastic 90 degree boot going into the engine. Does it have a "hand shake" clamp like the one on the sensor above? Are there parts diagrams or info on this? I'm not sure if cleaning the MAF & reset, will help the CIL errors but thought it was unlikely that both O2 sensors would both go out at the same time. Any thoughts would be helpful. Another question I have concerns changing the transmission fluid. The car has 100k and runs & shifts great. I don't have the service records that show if the fluid or filter has been changed. The dip tube has a red tab that shows that it has been opened. Is there anyway to check or sample the fluid without dropping the pan. To Change or not to Change?? Thanks for this great forum.