After Formula One, Klien began racing in a number of categories including endurance racing, sports cars and V8 Supercars.
He was close to a deal with Peugeot to race in the World Endurance Championship in 2012 before the French company withdrew from racing.

Klien has taken part in a number of V8 Supercar drives, including the Bathurst 1000 where he teamed up with Russell Ingall.

Since late 2012 Klien writes a monthly column for the Pitpass.com website.

In 2014 Klien signed a deal with NewBlood By Morand Racing to race in their 2014 ELMS campaign.

In 2017 Klien joined the Bundesheer (Austrian Armed Forces) and will continue his racing career in addition to military service.
After Formula One, Klien began racing in a number of categories including endurance racing, sports cars and V8 Supercars. He was close to a deal with Peugeot to race in the World Endurance Championship in 2012 before the French company withdrew from racing.
Klien has taken part in a number of V8 Supercar drives, including the Bathurst 1000 where he teamed up with Russell Ingall.
Since late 2012 Klien writes a monthly column for the Pitpass.com website.
In 2014 Klien signed a deal with NewBlood By Morand Racing to race in their 2014 ELMS campaign.
In 2017 Klien joined the Bundesheer (Austrian Armed Forces) and will continue his racing career in addition to military service.
Christian Klien