The JH23was a Formula One car built and raced by the AGS team for the 1988 Formula One season. It was powered by the Ford Cosworth DFZ engine. A single car was entered, driven by experienced Frenchman Philippe Streiff. The JH23 proved to be a good car for the small French team, in only their second full season in Formula One. The car managed to qualify for all 16 races including 12th at Monaco and 10th at Montreal. However whenever it got close to scoring points, the car broke down. Streiff only managed to finish 6 races, the best result being 8th at Suzuka.
The car was updated with a Cosworth DFR engine for the 1989 season, to become the JH23B and for the first time the team entered two cars. The drivers were Phillipe Streiff and the rookie German Joachim Winkelhock. The season got off to a tragic start as Streiff was seriously injured in a pre-season testing crash at the Jacarepaguá circuit in Brazil. This left him paralysed and thus using a wheelchair. Italian Gabriele Tarquini took over from Strieff and had a good season, the highlight being a 6th place in Mexico. However his team mate Winkelhock and later on Yannick Dalmas failed to get past pre-qualifying. By Spa the car was replaced by the JH24.
After Formula One
Three JH23 chassis were built, two are still owned by AGS and the other is on display at the Lohéac Automobile Museum.