another simple z6 q

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im tired and tired of looking, on a honda crx 90, does it mater where the 4 wire o2 is installed , should it be on the top of the manifold or at the end before the cat, i was told i dont need 2- 4 wire o2 sensors i can use 1- 4 wire and the stock one from the crx as my second.

im using a p28 with the obd1 harness and sub harness

 

[AHHVTEC]

use a 4 wire 02 sensor and you can mount it anywere before the cat

 

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so it dont matter witch one is first(the 4w or the 1w)

 

[AHHVTEC]

you dont need two just use the 1 4 wire 02,,,you only need 2 on obd2 ecu

 

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ty

 

[801CRX]

You could use your CRX motor exhaust manifold that has the O2 hole in it already.
And yes OBD1 only needs 1 sensor as ahhvtec stated. Or does the Z6 mani already have the hole?

 

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i puchased one that has two holes but they also sent a plug for one of the holes if you dont use it