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Under the hood directly across from the cooling fan on the forward side of the engine there is the exsaust manifold. This is where the sensor's home is located. On some models, the oxygen sensor is on the under side of the manifold. It may be under the car located on the catalytic converter. To remove the sensor, the front bumper, grill, and radiator are removed for ease of access, as the sensor has often welded itself to the manifold. Often, very high heat (from an acetyline torch) must be applied to the manifold (off the vehicle, of course, to prevent a fire) to free the sensor. This heat will destroy the sensor, so be sure it is non-functional before you go to all this trouble and expense.

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