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  • The SCR process involves the injection of urea into the exhaust pipe.

    https://en.wikipedia.org/wiki/Diesel_exhaust_fluid

    Coming soon to a car near you, as some manufacturers will be using SCR to get small diesels to pass Euro 6 tests. If it's working properly, you shouldn't get significant amounts of ammonia in the tail pipe, so stinky buses are likely to be suffering from a defective sensor somewhere.

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