my max turns on the cel when i run cheap gas (my wife does that) shows rear o2 and knock. put in good gas and reset and it stays off. anyway it came on and the only thing i could find wrong was that the air intake hosing was coming loose. i fixed this and reset the ecu (no i did not check code, so used to it being the same thing) anyway could an intake leak after the maf cause the cel to come on?

if it comes back i will check the codes and see if they are different.

 

Didn't check the FSM, did you?



The last item listed on the far right.

 

no i don't have an fsm, just common sense told me that was most likely the prob.

thank you for the answer!