Katoh started karting in 1990 and entered four-wheeled racing in 1992 with
Formula Toyota. He would then compete in the
Japanese Formula 3 Championship, with a highlight being a 6th place at the
Macau Grand Prix. Katoh entered the
All Japan Grand Touring Car Championship in 1997 with Kraft and has competed mainly in that series since; his best championship result was a 2nd place with Cars Tokai Dream28 in
2006 and
2007. He has won seven races as of 2023. In 2021, Cars Tokai Dream28 and
INGING merged to form a collaborative entry known as muta Racing INGING; Katoh would drive for the team alongside veteran driver
Ryohei Sakaguchi. Katoh stepped back from racing full-time in
2023, becoming the director for muta Racing INGING; he remains in the team as a third driver. In addition to Super GT, Katoh has raced in the
24 Hours of Le Mans multiple times. Outside of racing, Katoh is an instructor at the Honda Racing School in Suzuka and a driving advisor. ==Racing record==