senic petrol i.6 2001 eng codek4m a 700 very poor idling

[mickeybo]

code read vehicle above with hand held code reader faults came up were
po130 heating oxygen [ho2s] bank 1 circuit malfuction heating inoperative poor connection wiring

po135heated oxygen sensor [ho2s]1 bank 1 heater control circuit malfunction i removed sensor from exhaust to bench test sensor markings
a b c d on hooking up to battery a to + b to negitive to check heating on oxygen sensor after approx 4/5 minutes alought it was heating up i was
able to put my finger. tip on it does anyone know how hot these should get after 4/5minutes or shed some light on this

reguards mickeybo