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exhaust b.p. tube cleaning

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Have any of you guys pulled the exhaust back pressure tube leading to the exhaust b.p. sensor? I have heard that it gets plugged with soot and wreaks havoc with the sensor. I am regularly setting the P0478 code for "exhaust pressure value high input", and wanted to try cleaning the tube before replacing the sensor.

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Brake cleaner and piece of wire chucked in a drill work good to clean it out. Clean the sensor itself out too. Those sensors are known to fail on a fairly regular basis also.

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