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where are o2 sensors vauxhall vivaro 06?

van has preheat light on and in limp mode. code reader gives fault as 02 sensor.where are 02 sensors located.
Peter, September 2016
Also called Lambda Sensor - detect unburnt oxygen in the exhaust system.

https://en.wikipedia.org/wiki/Oxygen_sensor

Good Luck..., September 2016
May help:

http://www.ebay.co.uk/gds/Replace-Your-Oxygen-Sensor-Do-Not-Ignore-Your-Check-Engine-Light-/10000000178356953/g.html

You could also do a Google search - this may fnid the info directly or it may uncover a dedicated Vauxhall Vivaro forum

xxx, September 2016
link Click here to see other fixes for Vauxhall Vivaro.