pascal100

Hi I'm having trouble with a denso universal sensor brought to replace the original one I had p0139 slow response to start with so I replaced the rear sensor and now I have P0138 high voltage does anyone have any ideas what it could be...? Iv connect the wires my self and 100% sure they are correct
I have a code reader too
Rx8 6 port no mods

Regards mark

RIWWP

iTrader: (2)

'High voltage' means that the wiring isn't correct.

pascal100

Do you have the diagram for the rear O2 sensor with the black blue white white wires

RIWWP

iTrader: (2)

The diagram i have I can't easily share (though my company's site), but looking into the factory connector:
- the upper left is the white/red, which is switched power from the main relay
- upper right is yellow, which is one of the two signal wires to the PCM
- lower left is red, which is the other signal wire to the PCM
- lower right is brown, which is the PCM ground.

You will have to match that up to what the universal sensor wiring dictates. If that is correct, then you will need confirm that all connections are solid.

pascal100

Thanks for that much appreciated I will have a look at the wires