Can anybody tell me how to test the wiring for the oil sensor temperature switch I don't want to test the switch itself I can do that it's not a problem it's the wiring I want to test hopefully somebody can help or is anybody have any ideas of why the oil warning light is on it's going Octavia 2011 1.6 TDI being like this for over a thousand miles so I don't really suspect oil pump oil switch is working fine any ideas thanks

 

Yellow or red warning?

Might be better posting in the Octavia forum

Red mate

 

If it's a CAYC engine the oil pressure switch (F1) wire goes via pin 1 of a 14 way black connector pair 'front left in engine compartment', ending up at instrument cluster (K) 32-way connector pin 27.

When they say left, that's as viewed from drivers seat facing forwards, so right side of bay as you look in from the front bumper.

 

it's a black wire going into the 14-way, a green/black coming  out heading to the cluster.

 

Before anything else, do an actual oil pressure test, you will need a gauge with an M10x1 adapter in place of the switch.