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Just an additional note about the Lambada Sensor (oxygen sensor)The purpose of the Lambada sensor is to detect imbalances in the air fuel ratio so that the ECU can make minor adjustments.
The sensor consists of a Zirconium oxide ceramic which becomes conductive for oxygen ions at 600 deg F. The Lambada sensor output voltage varies from about 100 to 900 mV during normal engine operation.
When the engine is running rich, ther is a low oxygen content in the exhaust, thus a high voltage is produced. When the engine is running lean, there is a high percentage of oxygen in the exhaust, thus a low voltage is generated. At the point of perfect combustion the sensor produces 450 mV.
Most circuits having a Lambada sensor have a high impedance circuit that replace the missing Lambada sensor signal with a default voltage of 450 mV. That is why many engines will run without it.
However, as rpm's vary so does the fuel and air mixture. Without the Lambada sensor, it is possible for the engine to run rich, with too much fuel and not enough air, or too lean, with too much air or not enough fuel. As you can see, the Lambads sensor corrects this problem for emmission control more so than anything else. Hope this info is helpful.
Regards
Steve
(Information taken from How To Tune & Modify Bosch Fuel Injection by Ben Watson)
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