Hey guys, I was hoping someone could help me find the pin locations for my o2 sensor,i have a 2001 Dakota 5.9 quad 4wd (California model) and id like to find the pins for the downstream left bank o2 sensor, this truck has 4 o2 sensors, basically I want to get a narrowband A/F guage,and I want to use this sensor to hook it up to..

 

Why bother?

Grab a Bluetooth OBDII reader, and let the ECU tell you what it's doing.

Plus, the downstream O2s? Are VERY lazy, since they're there to see if there's a delay. If there is, the cat's working. If there's not, the cat's missing. *grins*

To measure your A/F ratio, you want the UPSTREAM O2. And the narrowband won't tell you squat - well, it'll say "RICH LEAN RICH LEAN RICH LEAN". You really want to do it right and go wideband, where you can find out "10.7 ... 12.1 ...15.3"

RwP

 

If you have a good size smart phone or a laptop you can get software and a OBDII cable kit or Bluetooth sender kit and do the same thing.


Many easier options available to you

 

CarScan USB Car Diagnostic Scanner for PC ELM327 OBD2 Instructions

 

I already have a scan tool and have watched the PIDs,all my sensors are working properly, but, the one thing I've noticed is the downstream left bank o2 sensor(California only)this sensor does not oscillate from 0 to1 volts like the other 3 sensors, I've replaced it also, so I know the sensor isn't bad, but,what it does is reads in more of a strait line and correlates with the stoichiometric ratio as you give it throttle, as your cruising it will have a fairly steady .45volts rather than bouncing from 0 to 1 volt and this is why I feel a narrowband gauge might be of some actual use, my cats have been gutted also..so my question still stands, does anyone know what the pin numbers are for this o2 sensor?