Changes to the Clean Car Standard has been partly caused by supply problems out of Japan.

The Government is slashing charges on importers who don't meet carbon targets by almost 80% and launching a full review.

It is expected to save about $264 million in costs to consumers and will keep imported cars cheaper.

Transport Minister Chris Bishop told Mike Hosking it's been tough getting EVs into the country.

He says importers are racking up penalties and don't have the supply to get credits.

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