Fumes smell from vents when coming to a stop - 911 991 Turbo S

[paulnorfolk82]

I am hoping someone can help as this problem is spoiling my enjoyment of the car.

When I come to a stop, there is a strong fumes smell for a few seconds, I am unsure if it is petrol or exhaust fumes, but my understanding is that the air intake is at the front of the car.

With cabin air recycling turned on, the issue doesn't present itself, so it leads me to believe it is being drawn through the fresh air intake.

I have had the air quality sensor replaced, but this hasn't solved the issue.

The OPC state they cannot replicate the issue, but every time I have a passenger they comment on the issue.

I have found several posts in forums from people with a similar issue, but have been unable to find someone who has resolved the issue.

This is what I have worked out so far:

• Problem occurs when travelling at speed and coming to a complete stop.
• Fumes enter the car for a few seconds (they are quite strong) and then disperse.
• The fans need to be on/blowing, but the problem occurs with the a/c on or off.
• The problem doesn’t occur when the car is recycling the air.

Many thanks for reading my post.

 

[SteveAndrews]

I had this on my 996 and it turned out to be the seal on filler cap was leaking, despite visually looking ok!

 

[paulnorfolk82]

thank you for the reply, we have replaced that, but that unfortunately hasnt solved the issue