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Q:

Replaced o2 sensor,but keeps showing code PO141 on 1996 Geo Prizm

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Cleared code by disconnecting negative battery terminal,but after short time coe shows back up.
(1) Answer
(1) Comments
There are 2 O2 sensors in your vehicle. P0141 refers to the number 2 sensor, which is underneath the vehicle. The sensor under the hood is the number 1 sensor. The sensor is the likely culprit for this code, but that cannot be guaranteed.