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Updated 04-05-2017 at 02:19 PM by Kaz-kzukNA1 (extra contents)
As reported earlier, the rear O2 sensor just didn't want to move even after applying lots of heat. Probably, without removing the heat shield completely off the manifold, I can't apply the torch at ideal angle/position. So, tried removing it but once again, the heavily corroded and rounded bolt head in my way..... I wish Honda used different method/material for the exhaust ...