The rear O2 sensor doesn't affect the way the car runs because it doesn't make any adjustments to the ecu, it only monitors the exhaust emissions after the cat to establish whether the cat is doing it's job !
However,. it may mean an mot failure if the EML is lit at the time of the mot.
Could the fault code be related to high emissions ?
Last edited by magnuz; Sep 12th, 2019 at 11:48.
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