I'm a newbie to working on my b250 & I'm hoping you guys can help me. Have a engine light on, faults/codes say air quality sensor has a short curcuit, also have problems with filling fuel, so thinking that I it might also have an issue with the evap system. My Q to this base of knowledge, is where are these items are located, want to test the evap purge valve to eliminate it as a problem for engine display light. Hopefully you can help. Thankyou in advance.

 

moved to W246 forum...