Help with VTEC fault

Hello to all the PS AK forgers I am looking for help with my Honda Civic Motor D17A2 year 2001 I have a problem with the VTEC PS is not activated (I detail the following already check the valve internally its filter is fine. There is feeding of 13.5 Vlts in the connector of the valve that activates the oil pressure. Apply 10W40 The problem is present (another point) I have present failure code (0141) refer to the oxygen sensor 2 will be for that present code that does not activate the VTEC.

Friend does not sound to me that the VTEC does not work for sensor 2, it seems to me that the oil is still very thin for the car ... you could try a 20W50, I hope it helps you

Since the datizer is poorly infulted because in accelerating there is a phenomenon called open loop where the Ecu, Central, Ecm Invoid the signal of such a sensor in this case the oxygen sensor.
Well, what may be that the valve that activates the system is stuck or damaged by being an electro valve you mentioned Aver Medio Voltage of the connector but not resistance to the valve.
The other can be the CMP sensor (cams position)
that is necessary to inform the ECU SOBLRE the valves.
You can be this sensor because the Viculo can leave using the data delivered by the CKP, TPS and started

well estimated I hope you find your problem.