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2005 9n3 1.2 lambda issue/testing

Gerbil1028
Gerbil1028
in Engine, Transmission and Exhaust

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Morning all.  
 

have replaced the rear sensor as per fault code but the light is still triggering with the fault. 
 

is there a way to test wiring from car to O2 sensor ? What voltages should I be finding on which pins ? 
 

also is wiring failure a common issue ? Or did I buy a crap sensor. 
 

TIA 

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All Sorted, main 12v power to sensor broken 

9B71C69A-68B4-4B5C-804A-340EAAFBDF27.jpeg

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