VW TDI Recall

[davidbrady]

This is a good read: http://www.greencarcongress.com/2015/09/...-vw2l.html

Seems VW put a lot of effort and expense into their overly complex and unreliable LNT (Lean NOx trap), they were overly committed and when pushed it couldn't deliver so they added the software "fix", probably as an interim measure till they switch the cars over to SCR. (It's one of the more believable theories anyway).

The EPA runs their tests on new engines, then they run a 120,000 durability test, followed by another emissions test. With the "fix" disabled; i.e., software in emissions test mode, there's the possibility the engine may not achieve it's 120,000 mile endurance test which would mean there's no simple recall to make these cars legal.