Finally getting back around to looking into the o2 sensor code. I have a 91 civic with k20a2 type S swap with v3 Kpro, I am throwing a code p1166 for the primary o2 heater. Now the car drives fine I have been driving it for a few weeks I also have a AEM wideband which I have been using to monitor the A/F. I have traced all the wires from the sensor to relay/ecu and have found 0 issues they all go where they are suppose to.

I have bought 2 BNIB RSX-S Denso o2 sensors from acura dealer and I have also changed the relay for another BNIB one with no luck.

I could use some fresh ideas as I would like my oem sensor to work before I start upgrading the engine and taking it to the dyno.

Thanks

 

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have you checked the ecu to make sure none of the circuitry is damaged?

 

Yes I have opened it and looked at it closely it looks new with no signs of damage.

 

Error code p1166 may rise due to loose gas cap on fuel tank, so just check it and if its properly fitted try resetting the check engine light. Also check for air filter, poor air filter results in either lean/rich fuel combustion. Check the battery status, discharged battery results in error code.

 

But the sensor reads 10.7af constantly it does not show a reading at all, I reset the the engine light and reinstalled kmanager with new calibration and still no change. My combustion is good near perfect actually shows very similar AF readings to my flashpro in 06 Si which i DD.

 

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when you said you've traced the wiring, what does that include? just inspecting the wiring or have you check continuity?

 

I have just traced wires to make sure they are going to the right place on the relay and harness/ecu, I have not checked continuity yet but I have checked and the relay is getting power.

 

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have you followed this procedure yet?
http://www.k20a.org/forum/showthread.php?t=74581

 

^^ I have not found this procedure before when I searched K20a.org I will try this today.

 

I have tried the procedure I guess my Kpro could be bad its brand new tho V3, does anyone know by chance is the o2 sensor relay suppose to click at all when starting the car or anytime? I have yet to hear mine click.

 

Does the o2 relay click? Anyone?

 

? Anyone have an answer for question above? ^^

 

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Bump