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Lambda error 48


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Hi have just started my car for the frist time after having someone take a look over the ecu etc and identify some issues. after sorting those i can now start the start motor to witch it will idle very ruff. Witch leads me to fueling and having just installed the o2 senor to use the onboard lambda I find that I have no readings, have double checked wiring and I see no fualts under runtime values / euc status lambda shows diagnostic mode with error 48 ape over voltage? Do I have a dud o2 senor or am I missing something 

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Just "new wiring" doesnt mean it is correct.  Unplug both ends and confirm continuity end to end with an ohm meter.  Double check pinout both ends.  Make sure colours match the pin numbers.  Check terminals are not bent or stretched etc.  I have even found in one car I was diagnosing the terminals had been crimped onto wires without stripping the the wires first...:huh:

When you say "new plug", its still using the LSU 6 pin connector right?  

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