It's indeed normal. You'll only smell if on the off chance that your DPF was in a regen mode when you pulled into the garage, and smelled the end of the regen. It's when the engine ECM determines that the backpressure is getting to high because of the carbon build up in the filter, and it raises the temp in the exhaust stream to burn off the carbon.

In most cases, you'll be driving down the road when this occurs, and you won't notice a thing. If you were in an active regen when you parked, you may notice the smell, and the exhaust system 'pinging' when it begins to cool down. All normal.

If the regen didn't finish when you parked, not to worry. The ECM will be able to determine if more regen is necessary, and the algorithim will engage the system to complete the regen when all systems are in the proper conditions

A small price to pay for clean exhaust and 27+ MPG.

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HP gets you to speed, Torque keeps you there !

1928 Model A Coupe
1957 MGA SOLD
1994 MBZ SL320
2007 Acura RL
2010 X5d 11/13 PCD