A Vehicle Exhaust Testing Gas Mixtureor fumes carbon monoxide (CO) analyzer is an instrument for the estimation of carbon monoxide among different gases in the fumes, brought about by an erroneous burning; the Lambda coefficient estimation is the most widely recognized. The standards utilized for CO sensors are infrared gas sensors and compound gas sensors. Carbon monoxide sensors are utilized to survey the CO sum during a Ministry of Transport test. In request to be utilized for such test, it should be endorsed as reasonable for use in the plan. In the UK, a rundown of adequate fumes gas analyzerâs for use inside the MOT test is accessible by means of the Driver and Vehicle Standards Agency website.