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I recently replaced an O2 sensor on one of my cars. At idle the old sensor moved a bit quicker than this inasmuch as it was difficult with a digital meter to see each of the numbers. They changed too quickly. The Haynes manual states "the numbers will flash very quickly, so be observant".
Apparently, yours is moving slower than this. Also, I believe it should react quicker on throttle to idle transition.
As for the voltages, these seem ok. The Bosch FI book shows Lambda 1.00 = about 0.7 for a new sensor and about 0.6 for an aged sensor.
As for the heater resistance, the Bentley book and the Haynes indicates cold heater resistance = 3 ohms; hot = 13 ohms.
As for mileage, references point to about 100k (or less) for a maintenance change interval.
It seems to me that more than likely the sensor is operating lazy. On the other hand, it is still performing and has not set an ECU fault code. These sensors seem to last a long time. Nonetheless, if it was my car I would probably change it, if not for anything else, for mileage. Also, to help prolong the life of the Catalytic Converter. I would suspect that the mpg would improve (eventhough it's already good) slightly.
If you want to conduct additional tests, there is a lean and a rich test that can be done. The FAQ has details.
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dnvolvo '89 765T 200K - '91 245 100K
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