can anybody tell me if the sensor has to be vertical or can it go horizontaly ?? . The reason i ask is that it would look better and out of the way . Thanks in advance Dion .

Needs to be in the very hot part of the exhaust preferably a little after the headers, which way up is immaterial. Hope you got your oil/water prob sorted.
Russ

The lambda sensor must be mounted above the horizontal.
This is especially true of wide band sensors.
The ideal position is in the top of the tube as close as possible to the manifold.
The one position it should never be is in the bottom of the exhaust.
Water which is a natural component of combustion will kill it if you do.

quote:

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Originally posted by russbost
Needs to be in the very hot part of the exhaust preferably a little after the headers, which way up is immaterial. Hope you got your oil/water prob sorted.
Russ

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Just after the exhaust collector, unless you are fitting one to each cylinder!!!
ATB
Phil

If you are using a 4-2-1 manifold which means the collector is a long way from the head face, would this cause a problem with narrow band sensor? Im talking about a side exit exhaust system as well which mostly external. I would guess you just need to ensure everything i up to temp before taking readings for eg an AFR meter.