if the o2 sensors in 06 up bikes are stiochiometric which can only measure 14.2 to 15.2 (in autos the are single wire) whydos the (2wire)sensors in my 06 dyna output voltage vary from 0.97 to 0.69. which is 12.1 to 13.8 ??.

 

Rather than try to restate things, here's info from the Bosch web site:


Unheated Thimble: This was the first oxygen sensor design and Bosch has been producing them since 1976. These sensors either have one wire or two (for purposes of grounding), since they do not require power for a heater element. They use a zirconia ceramic element to generate a voltage in a rich (insufficient oxygen) gas environment. They can take several minutes to reach operating temperatures of 625 degrees Fahrenheit after a cold start, however this varies with application as the location of the sensor determines the rate at which it heats.

Heated Thimble: These sensors were introduced by Bosch in 1982 and function in the same manner as the unheated thimble, however inside the thimble is a special heating element that brings the sensor up to operating temperature in about 30-60 seconds. The additional wires to power the heater- typically a total of 3-4 wires (dependent on grounding scenario) can identify these sensors.

Planar: This sensor was introduced by Bosch in 1997 and also uses the zirconia ceramic sensing technology, but placed in a more compact thin flat shape (hence the name) instead of a thimble or conical shape. This allows the sensor to be smaller and lighter. They also require less electrical power as the heater is integrated into the smaller sensing element. By model year 2004, planar oxygen sensors are expected to account for over 30% of all new oxygen sensor applications and by 2007 for over 50% of new oxygen sensors. These sensors also have only four wires.

Wideband: This is the newest design of oxygen sensor and it offers the increased accuracy needed to meet the latest emissions requirements. Unlike all the other types of oxygen sensors, the wide-band sensor can actually measure the air/fuel ratio from 11:1 (excess fuel condition) all the way to straight air (no fuel)! (The ideal air/fuel ratio is 14.7/1.) This improved measurement allows the engine control system to measure the actual air/fuel ratio and eliminates the switching between lean and rich associated with a traditional type of oxygen sensor. These sensors use a planar zirconia ceramic element, so that they heat up much faster than other types of sensors- reducing cold start emissions. These sensors can be identified with having five or more wires. In addition, these sensors are used with the newly developed gasoline direct injection engines. Direct injection engines can use stratified charges, which produce a very lean mixture in the combustion chamber, and these sensors must be used because of their ability to measure from very lean to very rich accurately.




The HD/Delphi application uses the 2 wire 1976 narrow band O2 sensor. The system only goes into closed loop under specific conditions, eg steady throttle and cruise RPM. All they do is lean the AFR to 14.7in cruise to reduce emissions and increase fuel mileage. The rest of the time the system is operating n open loop and does not get input from the sensors.

 

i was going to by a air fuel meter that uses wideband sensors.im using pc111 with illiminators.was hoping to save money by using old sensors.thanks for the info

 

The second wire is for a positive ground since we have some rubber mounted engines.

 

Thought we had negative grounds. Justkidding, know what you meant.