clio 182 heater circuit problem

[yellowsport182]

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yellowsport182

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hi peeps, had my 182 for 3 years and never had a days trouble with it . its been off the road for two months . started it up the other day and it started missing, put it on diagnostics test and it says the heater circuit malfunction in the upstream sensor , changed the 2 sensors but still the same . any body got a clue whats wrong cos im pulling my hair out ????????????​

 

[MicKPM]

What did the live data show for the sensor voltage? Wiring problem is the most likely cause... without seeing the car i'd say corrosion in the multiplug to Ho2-2 but could equally be in the wiring between the sensor and the ECM.

Mick