Volkswagen recall plans rejected by US regulators
The California Air Resources Board (CARB) proposals did "not adequately address overall impacts on vehicle performance, emissions and safety". The board also said the proposed fix was not fast enough.
It said it would continue its investigation as well as talks with VW to find a suitable solution.
The head of the California Air Resources Board, Mary Nichols, said: "Volkswagen made a decision to cheat on emissions tests and then tried to cover it up.
"They continued and compounded the lie and when they were caught they tried to deny it. The result is thousands of tons of nitrogen oxide that have harmed the health of Californians. They need to make it right."
The federal Environmental Protection Agency (EPA) also said the VW plan for vehicles with two litre diesel engines was not acceptable. ■