[Jay B]

Does anyone have a list of trouble codes (maybe something posted online)specific to Landrover? I bought a cheap code reader, and found P1172 and P1175 (pending) stored. The CD that came with the reader doesn't know what these codes mean. Any help out there?

Thanks!

 

[Disco Mike]

Take a look at this site.
http://www.robisonservice.com/servicedep/rover_obd2.asp
Good luck,
Mike J.

 

[Jay B]

The P1172 says too rich, both banks. P1175 (pending) is Lambda control adaption fault, minimum signal. Any idea what might cause these? It seems that a Lambda (O2 sensor) fault wouldn't affect both banks. I changed the oil, thinking it may have picked up on some fumes from dirty oil. When I was doing emissions inspections, many years ago, dirty oil would cause a high CO reading, like it was running rich. After the oil change, the SES light came back on in a few miles.

 

[Disco Mike]

Jay,
So how many miles on what year and model truck are you talking about????
Sounds like it's O2 time. What do the pugs look like, are the plug wires original?
Mike J.

 

[Jay B]

The truck has 64000 miles. We were discussing the 60k service recently, and I'm working on it, piecemeal. Two plug wires on the right bank look a little shabby (boots look white and "frosty"). I am planning on replacing them soon (the whole set).
It's been my experience that a misfire will cause a low CO reading and high HC, similar to a too-lean mixture. None of my previous experience has been with Landrovers, and I quit working on cars for a living in 1994, so the OBD II and many of the newer electronic systems are new to me.

Maybe if the HC from the misfire gets burned in the cat, the downstream O2 sensor will pick it up the extra CO as "rich"?

If the mixture is rich on both banks, the only component I can think of that's common to both banks is the MAF sensor.

Thanks for the advice, I enjoy these discussions.

 

[Disco Mike]

Well for sure get rid of those plug wires, might look at a set of 8mm. Magnacors, less then factory and much better.
Try www.offroadtuff.com/ they have always treated me right.
I run those along with Bosh Platium Plus 4's and get alot more low end torque.
Let me know how it goes.
Mike J.