Mitsubishi has lied about the fuel economy of its cars for the past quarter century and the company is now facing a collapse in its share value.
It is now only worth half what it was last week after it admitted engineers falsified data since 1991, but only the Japanese models have reportedly been affected and no compensation for buyers has been outlined, after the anomalies were reported in cars it made for Nissan.
Japanese Government officials now say they will tighten up on testing and declaring fuel figures for all cars sold in the country.
Since Volkswagen last year admitted rigging results in the US, the American regulators have censured Hyundai, Ford and Daimler and in Europe Opel has been probed alongside PSA Peugeot Citroen.
Historically, Mitsubishi has form for not declaring issues since the 1990s when a safety flaw meant some truck wheels would fly off and two years ago it had to change the way it tested and stated the fuel economy of its Outlander PHEV after customer complaints about claimed consumption.