2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Is this the O2 sensor wire?

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Old Aug 21, 2023 | 05:52 PM
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maaaaackle's Avatar
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Is this the O2 sensor wire?

Hey guys, i just need to double check quickly here, this is the O2 sensor wire?


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Old Aug 22, 2023 | 09:09 AM
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From: https://www2.mazda.com/en/100th/
90% sure it is, the other choice is the knock sensor if its a turbo, but i think that is with the TPS branch of the harness
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Old Aug 22, 2023 | 12:35 PM
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Yeah sorry I forgot to clarify. This is an 87 NA FC.

Funny you bring up the knock sensor though...did the 87s have a gray knock sensor wire? In the diagrams, im supposed to look for a gray one...but Im not sure what / where that knock sensor would be...
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Old Aug 22, 2023 | 12:44 PM
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From: https://www2.mazda.com/en/100th/
Originally Posted by maaaaackle
Yeah sorry I forgot to clarify. This is an 87 NA FC.

Funny you bring up the knock sensor though...did the 87s have a gray knock sensor wire? In the diagrams, im supposed to look for a gray one...but Im not sure what / where that knock sensor would be...
the NA didn't have a knock sensor. the turbo does, and i think its white? although its shielded and the shield is gray
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Old Aug 22, 2023 | 01:38 PM
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I see. thanks for chiming in.

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