Locating the O2 sensor on a dc5r

[WuackR]

Can anyone help me locate where the Oxygen (o2) sensor on a dc5r please ?

I've had my CEL flashing and found that the issue is something to do with my o2 sensor.

Please advise.
Thanks in advance. :)

[M@lew]

On the exhaust, one before the cat and one after.

[WuackR]

Is this reachable from the top of the engine bay or must I reach from the bottom ?

Do you happen to have a picture of this by any chance ?

[chargeR]

They are both accessed from under the car. To get them out you will need a fairly big open ended spanner, 21-22mm or so.

[Stig]

On the exhaust, one before the cat and one after.

How do you figure out which one is throwing the CEL? Just take them out and inspect?

[M@lew]

Probably depends what's wrong. Usually the more common cause is that your high flow cat (or something similar like a test pipe) is throwing off the second one o2 sensor due to the emissions which is why the CEL comes on. Generally the fix is to use a defouler to get rid of that light since it doesn't really affect too much and is more a notification. If the CEL is due to your first o2 sensor I think a "safety" mode kicks in and your car doesn't rev past 4? (Not 100% sure if this is the case with all cars or if it has anything to do with the o2 sensor but I think it happened to my friends car).