https://docs.emtronaustralia.com.au/engine-management/config/channels/sensor-installation/index.htmlSensor Installation Installation angle must be inclined at least 10° towards horizontal, (electrical connection upwards) up to a maximum of 75°. This prevents the collection of liquids between sensor housing and sensor element during the cold start phase. The angle against the exhaust gas stream should be aimed as 90°. Maximum inclination should be 90°+15° (protection tube towards gas stream) or 90°-30°.Hugoen-us