How to unplug an O2 sensor

Post by **olpossum** » 20 Oct 2017, 13:41

It's on a '99 S70 with about 265,000 miles on it. I've tried a few things, and the front oxygen sensor harness won't unplug.This is very difficult and I don't want to use some chemical or be too rough. Is there some trick, or is there something I can use to help?

Post by **erikv11** » 20 Oct 2017, 15:40

If the connector is like on a 98 and earlier, you need to pry the red lever out away from the black plug housing, like with a screwdriver. Then it will separate easily.

Post by **JimBee** » 22 Oct 2017, 10:19

What I recall from changing one several years ago. The red lever erik refers to looks like the end cap on the p80 cars. If yours is the same, that end cap is attached to 2 longish glides that are inside the housing and are angled so when the end cap is levered out the connector (plug with the sensor wires attached) rides up on the angled glides to disconnect. My experience was that it took a fair amount of force to pry out the cap to pull the glides out to disconnect the plug. Reconnecting it is hard, too. Lightly coating the glides with conductive / dialectric grease might make it easier to reconnect.