The pre-catalyst Bank 1 Sensor 1 sensor and the DME's primary mixture-feedback device. On these MINIs its data is presented as a wideband lambda measurement rather than narrowband switching voltage, so it reports how far combustion sits from the commanded mixture rather than simply rich or lean.
2010 MINI Cooper (R56)
A 2010 MINI Cooper read lambda 0.923 against a commanded 1.000 after an upstream oxygen sensor replacement. How to correlate the mixture PIDs before buying another part.
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