California Smog Testing Will Now Sniff Out (and Fail) Tuned ECUs
California Smog Testing Will Now Sniff Out (and Fail) Tuned ECUs
Beginning July 19, 2021, Californian automotive enthusiasts have yet another item to add to an ever-expanding list of dos and don'ts (mostly don'ts) regarding their mandatory biennial visits to certified smog facilities. Up to this point, if your car was armed with modified programming (software) on its ECU (Engine Control Unit), and as long as you passed a smog test, no one would raise an eyebrow. Come Monday, however, if your car's ECU program isn't verified as legal by a California Air Resources Board (C.A.R.B.) Executive Order, then your car won't pass smog, regardless of its emissions output