We just moved from NC to CA and now I have another vehicle having idle problems. 2003 LR Discovery HSE, 90K miles. I'm running the super unleaded that is available (91 octane) but the vehicle has a rough idle and is throwing a p0130 code. Plugs look good (changed out at 60K) and wires look pretty new as well. Acceleration is fine and haven't seen anything else in the way of problems except the 3 amigos keep popping up after an hour or 2 of driving. Anything that I can check or try besides changing out the 02 sensors on the drivers side? Oh yeah, also a little coolant leak from the small hoses under where the air intake plastic slides onto the intake (I think that's what it is called) Don't know if this could be causing any type of short. I'm open to all suggestions and ideas. Thanks, Jere

 

what type of air filter are you using? paper filter or no?

You need an ABS Amigo to read the ABS faults to figure why the 3 amigos are coming on.

At 90k you should really check all your coolant hoses for wear. Some might need replacement soon.

 

Where do you live in CA? I am in Northern San Diego county, and i have an ABS amigo you can use. Let me know if you are close enough by!

 

I am using a paper filter and live in the San Diego area...southern CA so it would be a pretty long trip! I just came back from the store with a new air filter to eliminate that as being a problem. I did notice some old engine oil on the front O2 sensor connector and will try to clean that off and see if it helps at all.

 

At 90K you are getting close to replacement. 100K they start going out. Do all 4 at the same time. roverparts.com was having a sale on them, still may be...

While you are there, order the throttle body heater kit. It is less than $25 and will resolve the coolant leak you have at the intake.

 

I just checked out roverparts.com and they are indeed still having the sale on both the front and rear O2 sensors for 59.95 each and 21.95 for the throttle body heater plate kit. I am guessing that the front is the same for the left and the right side and the back is the same as well. Changing out the air filter did nothing and now I have a second code P0171 Fuel system too lean) Should I wait on the O2 replacement?

 

I didn't know if anyone else had any suggestions before I purchase the 4 O2 sensors. That new code of P0171 is perplexing me. Thanks, Jere

 

when was the last time you replaced your MAF sensor? i would do the O2's (you will have to do them no matter what) then see if you throw the 0171 again with another code. then you know the MAF needs to be replaced

 

To stop the throttle body coolant leak, you can connect the to hoses that run into the throttle body heater (thanks for the tip okdiscoguy) until the part comes in! I did it last night and it worked wonderful. Where you live and where I live, there isn't much use for the throttle body heater, but to keep everything stock, it is good to replace it. I know its annoying though, every time you stop your truck, steam is coming from under the hood (at least that is what mine did)!

Best of luck and keep at it!

 

Don't wait for other suggestions, you have a failed 02 sensor, by code, what else do you need?
As for your plug wires, what color are they? If they are grey, they are original and warn out so consider replacing them soon then later to help regain some engine performance.