Greetings, it's been a while since I've been on here, so it just shows you the old beast can be more reliable than you expect

Anyway a week or so ago after descending a long downward incline, the EML came on. It stayed on for a day or two then dissapeared. A few days later, when again going down a hill on overrun, it came on again, and again after a day or so it went out.

When it came on today for the third time I put my very simple error code reader on, and the code read "Mass or Vacuum Air Flow A Circuit Range/Performance". I cleared the error and it didn't come straight back.

So what's the likely culprit causing it to happen on a 2007 Grand Voyager 2.8L CRD with 93K on the clock ?

Ta