I am using the car of Santro 2004 model running over 76000 km. I have installed a BRC kit with Lambda and advancer a year back. Soon the temperature down here in Delhi, now it has got a problem in switching over to CNG. I went to a CNG technician. He told me that the oxygen sensor of the car is associated with the lambda. Over a period of time the effectiveness of car sensor falls and needs substitute. Someone told me it reasonably expensive. Now I discovered that if I start my car with full throttle it switched over to CNG. Please help me out with the additional details for it.