TOKYO (AFP, BLOOMBERG) - Nissan said on Monday (July 9) it had found falsification of data on emissions and fuel efficiency for cars made at almost all its plants in Japan.

The company did not say how many cars were affected by the falsifications, which come after a damaging scandal over subpar inspections last year.

Shares of the carmaker fell in Tokyo trading after announcing it will hold a press conference on exhaust measurements.

The shares tumbled as much as 4.8 per cent to 1,001.5 yen, the lowest intraday level since April 17, 2017, according to data compiled by Bloomberg.

Nissan found that emissions data were falsified during internal car inspections this year, the Asahi Shimbun reported Monday.

Nissan halted vehicle registrations in Japan last year after its inspection process was deemed faulty by the government.

Workers not authorised to certify vehicles approved the final inspection at the very end of assembly lines and that process may have dated back to 1979 at its Tochigi plant, according to a report from Nissan and a third-party law firm it assigned to investigate.