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1. Remove the 4 bolts securing the heat shield to the exhaust manifold, and lift away the heat shield for access to the sensor.
2. Trace the wiring from the sensor body back to its wiring plug and disconnect it. On models with two sensor, the second sensor is located in the exhaust pipe, under the oil pan. Not how the wiring is routed, as it must not come into contact with hot exhaust components.
3. Unscrew the sensor from its location, and remove it. Once removed, take great care that the sensor is not dropped or damaged. Kepp the sensor tip clean while it is removed.
4. Installation is reverse of removal.
Good luck, I copied this answer from Chilton's.
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How do you replace the oxygen sensors in a 2003 Honda Element?
To replace the oxygen sensors in a 2003 Honda Element, first, ensure the vehicle is turned off and cool. Locate the oxygen sensors, which are typically found on the exhaust manifold (upstream) and the exhaust pipe (downstream). Use a wrench or socket to unscrew the old sensors, then install the new sensors by threading them in and tightening securely. Finally, reconnect any electrical connectors and clear any check engine codes if necessary.
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The oxygen sensors are screwed into the exhaust pipe behind the engine.
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I don't answer questions for free. I work for $108.88 per hour, and your time starts now.
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Without knowing what sensors you are trying to replace, there is no answer. Please re ask question about a specific sensor.
