02 sensor wiring help

[VentoMKIII]

On the harness that connects to the 02 sensor, it is a 4 wire plug. I have a smaller disconected 5th wire. What is that and where does it go? I just replaced my o2 sensor and i am still getting o2 sensor and o2 wiring codes. Please help,


I also have 00515 Hall sensor code

I have reset the placement of 2 different distributors and i still have the code. I know that the timing is right, and what is the chances that both sensors went bad? It was running fine until one day this code decided to come up. Any help?

[VentoMKIII]

[VentoMKIII]

anyone?

[VentoMKIII]

ttt

[VentoMKIII]

up up up

[LG6R]

There should only be 4 wires. A fifth wire could mean that a previous owner has installed an air/fuel ration gauge and left the wire when he uninstalled the gauge. It looks like he had spliced it into the white wire. Make sure to cover up that exposed white wire.

If you're still getting codes, I would trace the wiring and look for any frayed or cut wires. I've had wires rust out and break on me before, including one for the O2 sensor. And make sure all the connections are solid.

[VentoMKIII]

There should only be 4 wires. A fifth wire could mean that a previous owner has installed an air/fuel ration gauge and left the wire when he uninstalled the gauge. It looks like he had spliced it into the white wire. Make sure to cover up that exposed white wire.

If you're still getting codes, I would trace the wiring and look for any frayed or cut wires. I've had wires rust out and break on me before, including one for the O2 sensor. And make sure all the connections are solid.

I tried tapping in the white wire for my air/fuel gauge, and then i started getting the codes, so i disconnected it. I traced the black wire up and it goes into the untouched oem wiring harness.

[VentoMKIII]

sss

[VentoMKIII]

ttt

[VentoMKIII]

ttt

[R32ool]

I have the exact same issue, however on the one I'm working on, both the black and white wires are broken off at the connector.

[R32ool]

I have the exact same issue, however on the one I'm working on, both the black and white wires are broken off at the connector.

Spoke to a tech at my local VW Dealership who said the black wire was likely unused. I guess some sensors use an external ground and it's there for that.

[VentoMKIII]

Spoke to a tech at my local VW Dealership who said the black wire was likely unused. I guess some sensors use an external ground and it's there for that.

Cool! thanks!