Volvo V40 fumes coming inside

[AlCapone]

Earlier I was a back seat passenger in a 14 plate Volvo V40
As soon as it stopped at a junction or lights fumes came inside
When it moved the fumes stopped
The local garage has checked the exhaust system and can’t find any leaks
Thanks

 

[AlCapone]

I forgot to say it’s diesel

 

[Lincsman]

Check rubber seal around boot/hatch

 

[deleted user 837354]

Is the exhaust manifold leaking and letting exhaust into the HVAC system under the bonnet?

 

[Timbo]

Earlier I was a back seat passenger in a 14 plate Volvo V40
As soon as it stopped at a junction or lights fumes came inside
When it moved the fumes stopped
The local garage has checked the exhaust system and can’t find any leaks
Thanks

Injector sealing washers. Very very common on the psa 1.6d. Find a garage that has a clue.