UK Car Repair Questions? Ask a Mechanic for Answers ASAP
to get a 'stuck O2 ' signal then this could be a few things
either as your man says a faulty coil or plug allowing 1 or more cylinder to misfire and allow raw fuel into the exhaust
or it could be a fault with the oxygen sensor , giving a false reading and forcing the ECU to run rich
this is turn can be caused by a leak on the exhaust manifold before the sensor or a fault with the sensor
as you have the intake off I'd push on with pulling the spark plugs on that side to see if you can spot which one is wet with fuel
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