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P0138 - OBD-II Trouble Code: Oxygen Sensor Circuit High Voltage
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P0139 Code: O2 Sensor Circuit Slow Response (Bank 1, Sensor 2) - In The Garage with CarParts.com
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BMW E46 Oxygen Sensor Replacement | BMW 325i (2001-2005), BMW 325Xi (2001-2005), BMW 325Ci (2001-2006), BMW 325ti (2001-2004) | Pelican Parts Technical Article