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70K on the sensor, change it, even if it's working it's sure to be a lazy sensor. Lazy means it's reaction time to change in O2 is significantly slowed compared to a new sensor. This reaction time is important to have a good closed loop O2 mode.
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Sal
1984 911 Carrera Cab M491 (Factory Wide Body)
1975 911S Targa (SOLD)
1964 356SC (SOLD)
1987 Ford Mustang LX 5.0 Convertible
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