Pre cat oxygen sensor. Located before the catalytic converter. Select O2 sensor location from the menu. Made by Bosch OEM.
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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