Throwing codes and rough idle + check engine light

[djatkinson]

My 2006 LR3 just started having a rough idle and poor performance + check engine light.
I'm getting the following codes: P0303, P0316, P0300, P0305, per the folks at Auto Zone.
Any educated guesses before I start throwing parts at it?

 

[tlt]

This would most likely be the throttle body needing to be cleaned. I use a can of BG 44k or Sea foam every couple of months in a tank to help keep it clean. You can clean it yourself if you are handy, there are some videos on it if you search. Start there.

 

[djatkinson]

From the research we've done, it looks like the 'crankshaft position sensor' is a prime suspect. It's a relatively inexpensive part, so I'll give that a shot and replace the spark plugs also.
We'll see...

 

[tlt]

The part may be inexpensive, but I believe you need to remove the valve cover to do it, then you get into a bit more hassle. Just clean the throttle body first and go from there. This is a fairly common issue, don't let your iid tool over analyze it for you.

https://www.youtube.com/watch?v=FMq7vHoxIuk

 

[Biagetti]

Yep, I agree with tlt. Just pick up a can of throttle body cleaner and maybe a mass air flow sensor cleaner and start there. You'd be amazed how this has solved the very same issue for a lot of us.

 

[djatkinson]

I think I'll do that next.

I did get the plugs changed out. They were shot. I don't know when they were last addressed.
Changed out the crankshaft sensor, but the symptoms are mostly still there.

If the SeaFoam in the throttle body doesn't work, it's off to the Authorized LR specialist...

 

[Bostonian]

Cleaning the MAF sensor takes about 5 minutes tops. Cleaning the throttle body takes a little longer but is easy enough that even I could do it. Maybe an hour just taking my time. There are great youtube videos on the process, it's pretty straightforward.