On Thursday, the Tories vowed to scrap the province's Drive Clean Program and the NDP promised to see if the emissions test was actually doing its job.
But the Premier stood behind it Friday, despite car dealerships shaking their fists.
Kathleen Wynne says it reduces emissions in the air, but Frank Notte (note-AY) scoffs at that notion.
The Director of Government Relations for the Trillium Automobile Dealers Association says he doesn't credit Drive Clean for that. He says vehicle emissions have reduced by 75 per cent because there are better manufacturing standards.
As for the test, he says it's a waste of time and money.
The province reduced the cost of the Drive Clean test from $35 to $30 but Notte says it still lines the government's pockets.
When the program was started in 1999, it wasn't supposed to make money. But fast forward to the end of last year and it has made $19 million in profits for the province.
Wynne made the comments at a stop at an ESL school in Toronto.