Problem: CEL Issues (Please post occurence and solution) - Page 80 - Mazda3 Forums : The #1 Mazda 3 Forum
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post #791 of 791 (permalink) Old 04-03-2016, 10:18 PM
Moped Rider
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Join Date: Jan 2014
Posts: 23
Had a P0131 (Upstream O2 sensor Low Voltage) and an intermittent P2251(Upstream O2 Sensor Negative Current Control Circuit Open). Fixed by replacing the upstream O2 sensor.

2007 Mazda 3 2.3L M/T
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