i think i am having same problem.
I powered my 430 on a dual carriageway as i do a lot of short journeys and the CEL came on. I reset it and came back on after 10 mins.
I assumed it was a dirty MAF sensor. The car did not go in to crawl mode.
Rick, when i get the codes, if it is one of these sensors are they easy to fit?
to obtain codes can i use the paperclip trick?