Honda/NTK O2 sensor

[Mark S. Riley]

Looking at the one I have from NAPA, OS-791, it has stamped on the body
approximately 1/4" down from the wiring juncture, the letters "L1H1". Next
row has "NTK   JAPAN" with "OYO2" stamped on one flat of the nut face. There
are 5 wires but there are seven pins in the plug. The cal resistor is across
the two pins with no wiring. With the offset directional guide for plug
orentation on the top, the wiring, top row, left to right is blank hole,
red, white, black. Second row again from the left, orange, yellow, blank
block where the cal resistor is located. Hope yours is right but it sounds
like you are missing the wiring for the cal resistor.

Mark
----- Original Message -----
From: "Dan" <dan at w3eax.umd.edu>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, July 04, 2001 2:19 AM
Subject: Honda/NTK O2 sensor


>
> I recently got two oxygen sensors from someone claiming they were off
> a Honda Civic (although he didn't know for sure what type).  I'm
> trying to determine if these are the wideband oxygen sensors as they
> aren't what I was expecting.
>
> The sensor barrel is approximately 2.5" long and perhaps 1.2 cm diameter
> (approximately).  The hex bolt has "NTK" and "7AH" (I think) stamped
> on it.  The the sensor element is approximately an inch long and 1 cm
> in diameter (not including the threads).  There are five wires coming
> off the sensor (red, yellow, orange, white and red).  The connector
> goes through what I can only describe as an extender cable, and then
> terminates into two connectors.  One connector has red and black, the
> other has yellow, orange, and white.
>
> I saw on some website that the heater was orange and yellow, and the
> white and black was the pump cell.  I checked the resistance, and
> orange/yellow resistance is quite low (<5 ohms), and the white/black
> one is somewhat higher, but not too much.  The red/black pair (should
> be the sensor) measured infinite resistance (while cold of course).  The
> wiring sure sounds like the wideband sensor, but the sensor itself
> doesn't sound quite right, and there is no cal-resistor in the harness
> that I can see.
>
> Any comments as to whether these are (or are not) the wideband sensors?
>
> dan
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