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2006-2009 Range Rover MkIII / L322
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6 Posts
Discussion Starter #1
I have a 2006 RR HSE non supercharged. Approximately 83,000 miles. Everything seemed to be going fine, and then bam the CEL came on. Went by the auto parts store and the codes P0128, P0171, P0174 and P0175 were all coming up. Is their a likely culprit that could cause all these codes to pop at once?
 

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2006-2009 Range Rover MkIII / L322
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3 Posts
Hmm. It may be your ECT (coolant temp sensor) as you've triggered both rich, lean, and low coolant temp codes. Although fuel trim failures can be caused by a ton of different things, so you may find yourself playing the narrow it down game.

That said, p0128 is more often than not a t-stat that is stuck open, or a worn/broken o-ring on the t-stat. And a dirty or faulty mass air sensor can trigger those other three codes. It may be worth checking out those as both are simple and cheap. I have heard the ECT replacement is easy and cheap too actually.

I just replaced my t-stat and it solved my 0128 and cel issue. I haven't seen the other codes personally though. Good luck!
 
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