Join Date: Apr 2012
Maserati Life Posts: 2,406
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The front O2 sensors output swings between rich and lean...The downstream do not and should remain steady with a good catalytic...Your pulling the 02 sensor out of the path of the exhaust so it doesn't see the swing..It works a good bit of the time, but not on all cars...Jason
ASE Master Tech. 29 years experience
Ferrari, Maserati, Land Rover, & Jaguar technician.
Guru in Atlanta of Jaguar V12 & XJS cars.