The 1-Series model use a total of 4 O2 sensors.Two before the catalyst and two after the catalyst.Select O2 sensor location from the menu.Made by Bosch OEM. Sold each.
Part# 11 78 7 558 055 Pre Cat in Front Manifold. Cyl 1-3 (1400mm length)
Part# 11 78 7 558 073 Pre Cat in Rear Manifold. Cyl 4-6 (910mm length)
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