Arvind Kejriwal greeting Sheila Dikshit at his Iftar party in July

Lieutenant Governor Najeeb Jung and former Delhi Chief Minister Sheila Dikshit are likely to be questioned after the Delhi Government today appointed an inquiry into a multi-crore scam related to fitness tests for CNG vehicles.Led by Chief Minister Arvind Kejriwal, the Delhi cabinet cleared a commission headed by a retired high court judge to investigate the scam that allegedly took place when the Congress was in power.The scam surfaced in 2012 when the state Anti-Corruption Branch found that the Delhi government had lost nearly Rs 100 crore in alleged irregularities in awarding of contracts to inspect and certify CNG vehicles.The government had hired ESP USA as consultant but a firm called ESP India, which was not registered at the time, was chosen and given the tender. The police said the company conducted two fitness tests on vehicles and charged for a third that was neither done nor needed.Files mentioned only "ESP"; the police say it was a fake company set up for the swindle.AAP has accused Lt Governor Najeeb Jung of trying to cover up the scam.When the scam erupted, the director of ESP USA in India, Nitin Manawat, and three others were arrested for allegedly creating the fake company. Senior Delhi Transport department officials, including MA Usmani, VK Gupta and Ashok Gupta, too were arrested.