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Went to Auto Zone to get my Tundra TRD scanned for a CEL. Dude puts the scanner on, says its the downstream O2 sensor is bad. Then he quotes me 125.00 for ONE O2 sensor. Checked the price at Rockauto.com they were 46.00 ea. Gives you an idea the markup on stuff at the big auto stores. I just put black tape on the dash, those downstream sensors dont modulate fuel ratios. *NM*