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The Haltech 4 Wire narrow band Oxygeny sensor (o2 Sensor) is placed in the exhaust stream and can detect if an engine is running rich, lean or at a stoic metric air/fuel ratio. The Haltech 4 wire O2 sensor is great for fuel economy on highway runs or cruising around town where the ECU can run in closed loop mode.
A 4 wire O2 sensor is not a necessity for all engines however if fuel economy is on your list of priorities then its a must have item.
The Haltech 4 Wire Oxygen Sensor couples with a weatherproof 3 pin connector.
