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Hi All, Got the emissions test failed with high CO emissions at 2500RPM. Took the car to Mr Dhammika at Cotta road and analyzed the emissions. High CO situation happens after letting off gas from high RPM (2500 - 750). Not at sitting idle or at high rpms, only when coming to idle from high RPMs. His suggestion was to replace the MAF, which I was not so sure of. Anyways I failed again with another used MAF (returned and got my cash back). Then I bit the bullet and purchased a scanning software for my car and analyzed the readings myself. The O2 sensor reads high voltage when com