Editing Lambda sensor (section)

==Description==
[[Image:lamba2.JPG|thumb|right|Lambda Sensor]]
The '''Lambda Sensor''', also known as an Oxygen or O<sub>2</sub> sensor, gives a voltage feedback to the [[ECU]] indicating the amount of oxygen in the exhaust stream, thus allowing accurate control over the combustion mixture. This is important to minimise emissions, maximise fuel economy and ensure the longevity of the catalytic converter.

On a standard Elise exhaust, it is located on the manifold downpipe, somewhat resembling a spark plug in appearance, screwed into a threaded hole facing the front of the engine. It will (usually) have 4 silicone sheathed wires emerging from it, and may also have an outer heat resistant wrap covering the wires until they have run some distance from the exhaust.

The wires are usually colour coded as follows:

[[File:Lambda_Wiring.jpeg|200px|thumb|right|Standard Lamba Wiring connector]]






*White (x2) - Terminals 3&4 - heater wires. Voltage is supplied via these from the [[ECU]] to pre-heat the sensor to its operating temperature when the engine is warming up. Polarity is not important.
*Grey - Terminal 2 - sensor ground (earth)
*Black - Terminal 1 - sensor signal (+<sub>ve</sub>)