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Just posted this for the same issue on another thread that was talking about Carbon Monoxide (CO) which is odorless. In this thread where you can actually smell something I would go to solution #2 below. What you are smelling might be Hydrocarbons (HC), or Nitrogen Oxides (NOx). All these gasses are very dangerous if coming into the cab of the vehicle.

I have 2 ideas that may help. 1. Home Depot sells a battery operated Carbon Monoxide detector that has a digital display. One of them is made by kidde, they have a 2 pack for $40.00. They have other brands to choose from with the display as well. You can find them on their website or in the store.

I do not have this problem with my Discovery Sport I just bought the detector for the house. When a vehicle is fist started with a cold engine that is when emissions are the highest out of the tail pipe because the catalytic converter is not yet hot enough to burn up the unused gases. I tested this device by placing it near the exhaust pipe when I started up the cold engine and it did read and display a high CO (carbon monoxide) reading. As the engine and emission components warmed up the CO reading went to zero.

2. You could also bring your DS to an independent repair shop that has an automotive grade emissions analyzer. (Instead of LR who may be trying to protect themselves from a buy back situation. It is also possible they do not have an emissions analyzer as they are very expensive and require maintenance). If you live in California I can help you find a shop that has one.

With the Home Depot unit, or the automotive grade analyzer you could take photos or live video of the event and bring it to LR to help settle your case.
 

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I have a 2016 HSE LUX. Gas engine. I notice the exhaust smell while sitting at idle for an extended period. Like when pulled over to talk on the phone with the engine on, or stuck in stopped traffic. Since I own a California smog inspection station I went to my shop and recreated the scene where the exhaust smell occurs in the car cabin just sitting at idle. All doors and windows closed, I put the tail pipe sniffer inside the car to read any Carbon Monoxide, Hydrocarbons, NOx. Even though I could smell that smell there was no reading at all on the test equipment. All were reading 0 except 02 at 21% which is normal. So I now know it is not CO, HC, or NOx that I smell. I now think it could be some sort of gasket adhesive or something like that? Has anyone had a successful repair that eliminated the smell?
 
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