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Message: <blockquote data-quote="huskar3399" data-source="post: 596956" data-attributes="member: 25472">i found this on a website. Sensor(s) 1 indicate the front sensors near the manifolds of the engine. These sensors monitor the fuel and air ratio and the computer will make adjustments to the engine to compensate for a bad sensor. With that in mind, just because a sensor code triggered the MIL in the BMW E39, does not mean the sensor is bad. Rich or lean fuel codes may indicate a more serious problem with the engine that the sensor simply detected. Sensor(s) 2 indicate the post catalytic converter sensors and monitor the emissions after the converters. Bank 1 and Bank 2 indicate the different exhaust streams that the sensors are located in. Bank 1 usually indicates the position of the first cylinder, in which case is located on the passenger side of the BMW E39. Bank 2 is the driver's side. If a sensor has failed to transmit data, a faulty voltage in the sensor could be to blame and would condemn the sensor. However, as mentioned, if the code detects a performance issue in the engine that points to an oxygen sensor (such as lean or rich fuel mix), replacing the sensor may only temporarily solve the problem, if at all, and may inevitably damage the sensor replacement. The sensor may be trying to communicate that there's a problem with the engine performance, but has not yet compromised the sensor itself. If left unattended, the problem could compound and damage the sensor and even the catalytic converter(s).Read more: How to Check BMW E39 Oxygen Sensors | eHow.com <a href="http://www.ehow.com/how_5074603_check-bmw-oxygen-sensors.html#ixzz1rW18rsto" target="_blank">http://www.ehow.com/how_5074603_check-bmw-oxygen-sensors.html#ixzz1rW18rsto</a></blockquote>

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