"if it was that easy to fix legally why did they cheat in the first place??" Your car did take a performance hit and fuel economy hit. Not a big one, but enou

"if it was that easy to fix legally why did they cheat in the first place??" Your car did take a performance hit and fuel economy hit. Not a big one, but enough to make it less competitive during instrumented tests by journalists. Tests are showing about 5-6% fuel economy hit which is not trivial, and also engine performance hit in higher RPM band. Luckily, most car buyers don't push their cars enough to notice.