o2 sensor for M20B25 swap

[Andy348]

I'm going from an eta o2 sensor to an i one. I have both installed on different exhaust systems. I figure that I'll need to splice the wires from the eta connector and connect it to the i one so it'll plug in, but I'm not sure how I'm supposed to connect a 2 wire to a 4 wire.

Any ideas?



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[nando]

you need a 4 wire. the B25 sensor is heated, which the eta sensor lacks.

[Andy348]

So I need a harness for a 325i connector? Do I need a new connector where it plugs in or are they the same format?

Lol, very confusing

[jlevie]

There are two variants of the M20B25 engine harnesses and thus two different sensors. You need the sensor that matches the production date of your engine harness.