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These codes are for the O2 Sensor - One is for the heater core inside the O2 Sensor, the other is the sensor. It's gone bad! - No Activity, is what it will read. It's the (Bank 1 Sensor 2) Not sure where it's located, ibelieve it's right in front of the Cat. good luck.

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Q: What do the obd code P0141 and P0140 on a 1997 Volkswagen jetta mean?
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