2017 Levorg High Idle
 

HI there,
I have a 2017 Levorg 51,000km and suspect an issue with the exhaust of MAF sensor (guessing wildly here)
Cold start ( 0 Celsius)
Neutral Idle RPM on start up 2,000 (slight incline) maintained until once in gear, idle drops to 1200 rpm. This rpm is also sustained on coasting.

A couple of observations:
Filter box and filter are a loose fit
Can sometimes smell exhaust gas in the cabin.
Fuel consumption on start up is 30L/100km average is around 15L/100km (urban)

Any help much appreciated.