The MIL light is only a possible symptom, its possible to have a duff sensor with no light showing.
The light will only come on once the sensor starts giving readings outside the expected range.
A faulty sensor can still give readings within range but the wrong readings which could result in fuelling issues. For example on a cold day, it could tell the ECU that its warmer and the result could be lean running
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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