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edevlin,
I found this on renntech.org (posted by Loren):
"P1275 Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Below Lower Limit
The diagnosis of "oxygen sensor aging" helps to identify oxygen sensors that exceed emission limits because of aging.
During the diagnosis of oxygen sensor aging, the DME control module monitors the period of the sensor signal. With an old sensor, the duration of the period is too long, i.e. it is more difficult for the sensor to diffuse oxygen into the exhaust gas. Reasons for this could be frequent driving in the lower load range (city driving, short distances, etc.) or a contaminated sensor.
Bottom line - you need to replace that O2 sensor. "
Good luck.
derb
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