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'91 CRX DX, D15B (D15Z7), DX L3
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My CIVIC EJ9 sedan 1996 do not have a second O2 sensor.
Just one with one wire at the exhaust manifold.
It varies with each market's emissions requirements. My D15B ("OBD2" Japanese-spec D15Z7 dual-VTEC) also expects a 1-wire O2. 1-wire functions the same as a 4-wire, but relies on heat from the exhaust to bring it up to operating temperature, and doesn't have the extra ground wire for the sensor element - it grounds through the manifold.
 

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Does my mixture is little bit rich?
Average consumtion is 8.1 litter per 100 km.
I suspect for O2 sensor.
Does one wire O2 sensor indicate engine light?
What to look forward?
 

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'91 CRX DX, D15B (D15Z7), DX L3
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116 Posts
Insulator color looks okay.

Average consumtion is 8.1 litter per 100 km.
That's not so great. Check your cylinder compression... You might have some leaky valves.
Alternatively, "tighten the loose nut behind the steering wheel". That is, lighten up on the accelerator pedal. Driving style has a huge influence on fuel efficiency. Accelerate slow and steady, avoid using the brakes.
 

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Which nut behind the steering wheel?

Understanding

Does bad one wire O2 sensor will indicate the engine light?
 
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