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4-wire, High Quality Narrow band Oxygen Sensor. Standard Threads 18mm x 1.5, substitute for any Bosch or NTK sensor. This is the sensor that our 034EFI ECUs were programmed to use as well.
There are 2 possible wire color versions, see below:
Black = Blue = Signal O2 output
Gray = White = Secondary ground
White = Black = Ground
White = Black = +12v Power