These VWs have already forced the metric thing along with a full line of Torx tools. Then there's "special" torx bits for pulling the tamper-resistant hardware (like on the airflow sensor and others). I'm quite accustomed to dropping belly pans so no biggie there.
As for sensors...man, I'll say this: It's almost 50/50 that the problem is either what the sensor says it is, or its the sensor itself.
