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2006-2009 Range Rover MkIII / L322
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I was getting CEL fault P0128. Replaced the thermostat but still getting the same code on a regular basis. Picked up the hose thermostat (PCH501310G) and wondered if anyone else has done that as a DIY project. If so, any helpful tips, specific tools or unexpected surprises?
thanks in advance.
 

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I had mine in and out while doing the trans cooler. Recommend that you get the dow corning silicone grease for the o rings in the pipes. Things might be a little stiff on disassembly so you may have to work the fittings a bit to loosen the crud. On reassembly check that the appropriate hoses are properly clipped into the rad shroud. The main crank pulley was a week away from cutting thru a hose that was not clipped in by someone who changed the rad before we got our 04.
 

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Let us know if that stops thd code. I have read that if will but it could also be the temp sensor at the tstat. Or lower rad hose. I have done the lower rad hose one but not the others. I have a lower temp tstat in there but no issues for s year and now if comes up. As a point of interest if I do not clear the 0128 code it puts up iirc the po171 and 174 codes after a few more cycles. It does show how interconnected the sensors are so little is as obvious as it seems.
 

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Finally got around to replacing the temp sensor near the engine thermostat on our 04 and also changed the trans cooler stat which I had read can cause the P0128. Over last few days the 128 code has not come up but recently got P1172 and P1175. I did change one 02 sensor pre cat so will see what gives now. I did notice a bit of looseness at the throttle body air inlet clamp which I had removed to change the temp sensor so will see if there is any chance it will solve the running rich scenario of 1172 (both banks)
 
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