O2 Sensor B16a

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Hi All,
Have just transplanted a B16a2 (1997 EDM) into a civic which used to have a ZC engine. All works ok except the engine check light is on and the idling is irratic for a minute or so before settling just under 1000rpm. The CEL says there's an oxygen sensor problem. The sensor we're using is from the ZC engine. (car has aftermarket exhaust and manifold) Does anyone what o2 sensor we need for the B16 (4 or 2 wire) and how we can fix this problem?