US regulators have rejected Volkswagen's car recall plans claiming it's not fast enough.

The rejection comes after the car company were caught fitting their diesel cars with devices that "cheat" emissions tests.

Officials from the California Air Resources Board (CARB) said the proposals did "not adequately address overall impacts on vehicle performance, emissions and safety" but "it's a step in the right direction".

The issue is thought to affect around 11 million vehicles world wide and a near 600,000 vehicles in the United States alone, where the company face fines which could run into the billions.

Volkswagen said "We are committed to working co-operatively with CARB and other regulators, and we plan to continue our discussions tomorrow when we meet with the EPA."

VW chief executive Matthias Muller and Environmental Protection Agency chief Gina McCarthy are scheduled to meet tomorrow in Washington to discuss the emissions scandal.

The emissions scandal has resulted in a 4.8% fall in sales in 2015, the first decline in 11 years.