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      12-06-2016, 10:11 AM   #63
nicklockard
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Drives: 2009 w/Nav; paddleshifters
Join Date: Aug 2016
Location: Phoenix

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Quote:
Originally Posted by JTC1 View Post
My temps are running in the low 70s so Tstat is on my list of to do's. Has anyone had any type of engine light for a T stat stuck open? My Indy seems to think that a stuck open Tstat should result in an SES light.
Nope, it won't set any codes in any modern (OBDII compliant) car I've ever seen. And they've eliminated the coolant temperature gauge or deliberately made them lie (Tdi's use filtering and lie by 15-30 degF, consistently).

Which is really surprising since engine coolant temperature is probably the SINGLE most important parameter for emissions. Emissions of soot and NOx are both increased with cold running engines.

I really don't get why the manufacturers do this. Well I do know: it's to reduce warranty visits and customer complaints. But it's bad for your car (running cold and longer warmups increases engine wear), bad for fuel economy, and bad for the air.
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