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95 850 O2 issue 850

Afternoon. Just wondering if anyone else has had this problem. Replaced the front O2 sensor about a year ago, threw out the 153 and 212 codes (front and rear o2 faulty). Reset the light and it happened 3 more times and then never came on again.
Now I replced the rear sensor yesterday, just got the same 2 codes after about 60 miles. Does the computer take a little time to adjust to the new sensors?
Any ideas? Thank you.
Also, I've replaced about every sensor on the car, still only getting about 15 MPG.
quinn388.






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