Quote:
Originally Posted by Ingeniator
Narrow band O2's are used pre cats to measure stoic/lambda the ECM then compares that signal with the reading from post cat sensors and it determines the Cat efficiency and flags if it does not meet emissions compliance.
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Maybe this was just a typo..... but the N54 uses
wideband pre-cat (control) oxygen sensors. The post-cat sensors are regular narrow band 02 sensors.