[headset 74]

i have a 2012 estate and if you open yhe back passenger doors or tailgate you get a blast of fumes that lingers for a while i blame vauxhall not making the exaust a few inches longer so its not tucked under the back bumper stopping it getting the fumes away from the car as you can guess diesel exhaust have more pressure than petrol hence the larger bore pipe

 

[headset 74]

you could check the flexi pipe up the front near the manifold they sometimes crack and start to leak if it is the fumes will find any slight opening in the bulkhead or hole were grommet is missing