02 Sensors?
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rob bartleman (02-09-2024)
#7
There are two different sensors, upstream (before the catalytic converter) and down stream (after the cat). The upstream sensors are used to monitor the exhaust and correct fuel trim levels based upon the presence, or lack thereof, of oxygen in the exhaust. The downstream sensors do nothing but monitor if the catalytic converters are functioning- they provide no feedback to the engine at all and are in place exclusively for emissions regulations. In some markets they didn't even fit rear sensors. A good running engine with a catalytic converter should have basically no oxygen in the exhaust after the cat, if there is, the catalytic converter isn't working and a check engine code is thrown.
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rob bartleman (02-09-2024)
#8
Two excellent replies. thanks to both of you. I am poised to buy the Nanocom "Evolution" for my 2006 LR3 (and to share with other LR owners I am coming across in southern Manitoba)... but I am wanting to make sure I wind up with a scanner that can read fuel trims. Have just started corresponding with the Nanocom office to answer that question. (The "Evolution", since it is not VIN-locked, seems to be my best option.... IF fuel trims can be displayed.)
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