[W126 Coupe] gotta ask

[Dan Landiss]

on 7/26/2007 8:41 PM Attila Makranczy wrote:

> Jonathan, wasn't there a post that the Mustang O2 sensor

> fit our cars and it came as a 4 wire ??  Also, it was much

> cheaper than the Benz version.


Basically all the Bosch sensors have the same insides and the same 
threads. The Mustang sensor was popular because it had fairly long 
leads, making it easier to splice other connectors onto it. About $32 at 
your local McParts store.

The "4-wire" sensors use the same element as the "2-wire," but add a 
heater. The element cannot sense the air/fuel ratio until it is hot, and 
pre-heating the element let that happen sooner, with beneficial results 
to the pollution ratings.

As far as I know a genuine "wide-band" sensor has a gentler transition 
slope of the Output Voltage versus Input Air/Fuel Ratio curve: 
<http://www.mainlineauto.com.au/products/emission/afr806/>. That makes 
it easier to measure A/F ratios, whereas the standard sensor is almost a 
switch, one voltage for rich and another for lean with a very narrow 
transition zone.

-- 
Netiquette: <http://landiss.com/email.html>