I just bought an OBD 2 code reader and it shows all the codes on my truck in the book except P2 197. Does anyone know what this one is? Thanks!

 

P2197 = O2 sensor signal biased, stuck lean (bank 2, sensor 1)

That's the DS front O2 sensor.

 

so should I justreplace it? I also have codes PO446, PO135, PO141, PO155. THANKS

 

That's a tough question. Is the oxygen sensor the problem itself or is it just reporting it? Even professional techs have a hard time diagnosing O2 sensor codes correctly on the first try.

Looking at the whole picture, you have a couple of O2 heater codes and a couple of O2 sensor signal code. It looks like these affect all three of your sensors but on different circuits. I would check for a melted/pinched wire harness or something like that that is common to all the sensors.

That is, of course, unless you created some false codes by running the truck with the sensors unplugged.

The P0446 is probably unrelated since it is for the fuel tank evap system.

 

Ok thanks. The only thing I can think of that I may have done was that I shorted out my park lights and had to get into the relay/fuse box under the hood and you may know how much of a ***** it is to get that lid off. Maybe when I put it back on I pinched a wire in a close by harness. Cause It was that same night that the check engine light first came on. The thing was idleing funny too. it would go from 2 grand to 1, to 2, to 1, etc. for about 30 seconds.

 

Maybe but the harness from the sensors is a straight shot up the transmission to the engine harness to the PCM on the PS firewall. At least that's how I remember it.

 

now I have a P2195. Can you tell me that one please!

 

It is the same as P2197 except it is for the passenger side front sensor.

 

Thanks. Is there a way of testing the o2 sensor at all?

 

who sells the OBD 2 reader? i need one for my 2000

 

https://www.ranger-forums.com/forum2...30&postcount=1

 

You can also get them from walmart.. not sure if they are 40 bux though! Thats a good deal there..

 

I found that for some reason my relay box was missing the fuse for the o2 sensors. The codes havnt shown up anymore on my code reader but the yellow emisions light stays on. Should i just ignore that light until the check engine light comes on or more codes are found?

 

What is a "yellow emissions light"???

 

On the OBD II code reader. Theres a green, yellow, and red light. Green means everythings good, yellow-emisions problem, red-emisions problem and code registered. I thought maybe someone else has an OBD II reader.

 

I have used several but I've never seen that type. It sounds like you have a problem still and the CEL is likely to return.

 

Heres the one I have!

http://www.canobd2.com/tool/3100c.asp

 

I llooked at the manual online and it says that there are 2 possible reasons for the yellow light:

• Possibility 1: There is a pending trouble code. To prevent false codes, the trouble must be found during 2 successive "trips". You're still on the first trip.
  
• OR ... Possibility 2: all of your emission monitors have not completed and your vehicle is not ready for state I/M testing.

The first one means that you are likely to have a CEL in the near future since the PCM has already found something that doesn't pass.

The second doesn't mean anything except that you haven't driven the truck long enough or under the right conditions for all of the monitors to run to completion. This will not light a CEL.

 

ok thanks