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Old September 29th 15, 02:18 AM posted to,,
SMS SMS is offline
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First recorded activity by DIYBanter: Aug 2006
Posts: 1,365
Default EPA caught VW cheating - how does the car know it's being tested?

On 9/20/2015 3:49 PM, sms wrote:


I had a smog check this morning on a 2007 Camry. The shop had a new
machine for newer vehicles. Since September 2013, 2000 and newer
vehicles no longer get tested on the dynamometer and no longer get a
probe shoved up their tailpipe. The whole test is done via the OBD-II
port (as well as a visual inspection).

For diesel vehicles you can see the details he

So clearly VW was not just looking at wheel rotation, they probably
turned on the emission controls whenever they detected something reading
the sensors. I wonder if an ELM327 transceiver or a Progressive
"Snapshot" would have any effect.