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Mercury Forum: 2004 mercury sable engine v6 ?
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Old 08-24-2014, 10:04 AM
buckiejr buckiejr is offline
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Default 2004 mercury sable engine v6 ?

Is both Oxygen Sensors one on the front of the engine the other on the back, are they the same part number Upstream and downstream Bosch Premium Oxygen Sensor Part No. 15717 i put Pictures of the sensors, is that the sensors that i should change.
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Old 08-26-2014, 10:56 AM
buckiejr buckiejr is offline
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ARE THEY 2 Oxygen Sensors IN THE 2004 mercury sable gs
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Old 09-19-2014, 11:42 AM
hixx hixx is offline
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The upstream o2 sensor is the closest to the cylinder head and before the converter. The downstream o2 sensor is furthest back and after the converter. All the downstream sensor does is monitor the efficiency of the converter. The upstream sensor tells the PCM to lean/rich the fuel mixture.
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