4 ms·
>If the computer says it is OK, it is OK, at least in most states. The downside of this method (or upside, I guess, depending on where you stand), over the sni
by ziddoap 2y ago
>If the computer says it is OK, it is OK, at least in most states.
The downside of this method (or upside, I guess, depending on where you stand), over the sniffer method, is that this is trivially bypassed. My race car, which is by no means emissions compliant, can pass this check with the press of a button.
- Aurornis 2y agoStates are beginning to roll out systems that do deeper checks on the firmware. Those, too, can be bypassed especially on older systems. However a lot of people are getting caught at emissions time now with cars that have been passing for years.
- PaulHoule 2y agoNotably the functional test (measuring exhaust) can be gamed too, see https://en.wikipedia.org/wiki/Volkswagen_emissions_scandal https://en.wikipedia.org/wiki/Volkswagen_emissions_scandal Emission control is a balance between emissions, fuel economy and performance. You can give up some fuel economy and or performance at test time and enjoy better performance at the rest of the time if the system knows it is being tested.
- deleted 2y ago[deleted]