P38A Lambda sensor?

2001 4.0L . Emissions were a little high for the mot, but managed a pass ( Italian tune up, cat cleaner, cleaned maff). Plugged in the nanocom ( after repairing damaged obd socket ) and found fault P1075 - running rich bank b. Swapped the lambda sensors over this resulted in P1072 fault - rich in bank A. Does it make sense to assume that I need to replace the lambda sensor in bank A ( passenger side rhd vehicle ) with a new one? Thought it best to ask before spending any money as sometimes common sense solutions aren’t exactly that with a p38!!
If a new sensor is needed, do I go with a p38 specialist part for about £100 or a £50 eBay item? Don’t mind spending more for a part that will last!

Many thanks

Neil

If the fault follows the sensor, it would seem that the sensor is faulty but someone with more knowledge will be along shortly.

Possibly but not necessarily.

I would swap them over. If you get code P01175 rich bank B instead - then it’s that

RangeRoller dt said:

Possibly but not necessarily.

I would swap them over. If you get code P01175 rich bank B instead - then it’s that

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He's already swapped them and the fault followed.