http://www.forparts.com/BoswidebandO2.htm

"The newest generation of oxygen sensors are being called "wideband"
lambda
sensors or "air/fuel ratio sensors" because that's exactly what they

do.

They provide a precise indication of the exact air/fuel ratio, and

over a

much broader range of mixtures - all the way from 0.7 lambda
(11:1 air/fuel ratio) to straight air!

The Bosch LSU 4 wideband oxygen sensor is a 5-wire sensor that reads
oxygen in much the same way as a traditional oxygen sensor.  but it

uses

the latest "planar" construction with a special two-part sensing

element

to measure how much oxygen is in the exhaust."

End of quote.

Now all you need is the senor and a cheap digital voltmeter.
http://importblowoutsales.com/
http://www.action-electronics.com/panelmeters.htm

A wide band O2 sensor is essential for tuning any fuel
injection system.

--
Paul Lamar ...No rotor no motor.

Paul,

From the same web site, next page:

"Because of the internal circuitry used in a wideband oxygen sensor, you
can't hook up a voltmeter or oscilloscope to read the sensor's output
directly.  A wideband O2 sensor produces a current signal that varies
not only in amplitude but direction.  That makes it quite different from
a conventional oxygen sensor that produces a voltage signal that bounces
back and forth between 0.1 and 0.9 volts.

The only way you can currently diagnose a wideband oxygen sensor is
through the vehicle's on-board diagnostic system using a scan tool."

Have a schematic to make a simple set-up?  I see lots of practical uses
aviation and otherwise...

Steve Webre
Broussard, LA

I did not read that. My mistake.  No real problem. We will figure it out.

A cheap digital volt ohm meter will read both positive
and negative voltages. If you apply the current to a resister
you can read the voltage drop across the resister.

E = I X R
I = .001 amp so a 1000 ohm resistor will give 1 volt positive
for 1.3 excess air and -1 volt for .8 excess air.


Start with this.
http://www.aa1car.com/library/wraf.htm