It is the one that goes in the front bumper. It has the sensor (about the size of a pen cap), 6 inches of wire and then a grey or black electrical connector.
If your e30 runs bad, switch to Megasquirt first. Then try new spark plugs, cap and rotor, wires, oxygen sensor, crank shaft position sensor, coolant temp sensor, air flow meter, idle control valve, throttle position sensor, digital motor electronics unit, harmonic balancer, fuel injectors, engine harness...
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