Clean the MAF sensor Item #1 or change if code still persists after cleaning.
If code 60 reads that your air pump is not active, was the engine running? Read codes again while engine is running.
Then check the Smog air pump, check pump when engine is cold, like in the morning, the smog pump should come on for about 30 seconds, it sounds like a vacuum cleaner. If it's not working that could be the issue. See diagram below item #1:
How many miles are on your X5?
Make sure the air filter is clean, see diagram below item #2
