Nissan discovers Mitsubishi was cheating fuel consumption tests in Japan

Japanese carmakers do a lot of badge engineering. If one of them has a car that may be interesting to the other, they change badges and sell them as if the other one was building it. This is the case with Mitsubishi EK Wagon. Nissan sells it as a car named Dayz. And everything was fine until Nissan discovered the fuel consumption of the eK Wagon was not as good as Mitsubishi said it was. Consequently, Nissan Dayz fuel economy was also wrong. That was when Mitsubishi confessed it was cheating fuel economy tests with this car.


Mitsubishi said 625,000 vehicles present the problem. Curiously, most of them were sold by Nissan: 468,000 Dayz and Dayz Roox and 157,000 eK Wagon and eK Space since they were put for sale, in June 2013. The companies now discuss compensations that Mitsubishi will have to offer Nissan, due to the problems the vehicles have presented, and Japan is now conducting investigation on other models Mitsubishi produces. The company has admitted other cars are involved in the problem. Sales and production of these 4 models has been halted.

The cheat consisted on measuring how much the cars slowed per second instead of the time they took to slow by 10 km/h, as the Japanese laws require. The equipment to measure car rolling resistance was also manipulated, using a different testing system than the one Japanese regulations stipulate. The company has been required to submit a full report about its fuel consumption tests within a week. Japan’s Transport Ministry will respond to this future report on May 18. Expect a heavy fine coming, as well as other punishments. Mitsubishi shares have already dropped 15%, the biggest one-day stock price drop in 12 years in Japan, according to Reuters.


Gustavo Henrique Ruffo

I have been an automotive journalist since 1998 and have worked for many important Brazilian newspapers and magazines, such as the local edition of Car and Driver and Quatro Rodas, Brazilian's biggest car magazine. I have also worked for foreign websites, such as World Car Fans and won a few journalism prizes, among them three SAE Journalism Awards and the 2017 IAM RoadSmart Safety Award. I am the author of "The Traffic Cholesterol", a book about bad drivers that you can buy at Hotmart, Google Play, Amazon and Kobo.