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Old 04-13-2021, 08:14 PM   #5
The Librarian
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Join Date: Nov 2011
Location: So Cal

A heated (3 wire) O2 sensor should be warm within a minute or 2. Unheated (1 wire) within 5 minutes. The O2 sensor needs to be grounded so the one laying in the pipe probably wasn't reading correctly.

If the sensor is working you're running lean. Did you verify that the in-tank pump is working? Some of the pumps being sold have the poles reversed.
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