There are no diagnostic fault codes that tell which component is causing the problem. The codes indicate the circuit or system. There could be sensor wires that fell down onto the hot exhaust system and melted, corrosion in the connector pins, corroded splices, etc.
If any engine repairs were done recently, there are a lot of rtv sealers that give off fumes that will destroy O2 sensors.
Based on the contradictory nature of some of the codes, I would start by looking for corrosion between the connector pins. Next, I'd recommend using a scanner to watch the sensor voltages change as the engine is warmed up and running.
caradiodoc
Jan 15, 2019 at 4:45 PM
(Merged)