It ordered the automaker to stop selling those eight models while it submits correct readings, a process the ministry expected would take a few weeks.
The announcement could prompt another fall in the automaker's domestic sales after it stopped selling the four affected minivehicle models in April-June. Possible compensation costs linked to the latest affected models may also hurt Mitsubishi's bottom line.
Japan's sixth-largest automaker has been struggling to recover from the mileage scandal which began in April, and whose initial findings included two minivehicle models produced for Nissan Motor.
An internal investigation by the automaker uncovered poor communication, slack governance and pressure on resource-starved engineers at the root of the automaker's problems.
Mitsubishi's market value has tumbled since the scandal broke. The ordeal prompted the company to seek financial assistance from Nissan, which agreed to buy a controlling one-third stake for $2.2 billion.
Mitsubishi has admitted to using unapproved methods to calculate mileage for 25 years, while it also used estimates, rather than data from actual tests, to calculate the fuel economy for its minivehicles.
The company has said the scandal will likely push it into the red for the first time in eight years due lost sales, compensation costs to customers and payments to Nissan, along with dealers and suppliers.
The automaker expects to post a net loss of $1.4 billion this year, and book an extraordinary loss of 150 billion yen ($1.47 billion). Domestic sales are seen tumbling by nearly half in the financial year through March, which will result in a 55 billion yen hit to full-year operating income.
On Tuesday, the firm said that it would post an additional extraordinary loss of 7 bln yen in current fiscal year due to costs involved with the additional eight models.
Japan is Mitsubishi's fifth-largest market, following markets including Asia ex-Japan, Europe and other regions. Its home country comprised roughly 10 percent of its vehicle sales during 2015/16.