started the fatty earlier and noticed she was idling a lot higher(900rpm) switched ignition off and re started it and it went back to its usual 600rpm with air con switched on....out with my I carsoft and the engines showing a fault that reads" Electric thermostat circuit fault last occurrence plausibility ? Everytime I clear the fault it returns.. Any ideas guys?

No idea at all but I've had the same for a while....

I take it yours wont clear either? I'm going to try a battery reset as I've just been informed it could be a glitch. Failing that I've a new upgraded thermostat to fit and hopefully that sorts it out...

I was considering the thermostat mod to try to clear the fault. Let me know if yours works

The thermostat mod won't clear the fault...

It will put up this code...

0x48D Engine cooling fan control fault

It does not create a bong or put the engine light on

It is irrelevant and doesn't effect anything else, it is just a control and not a sensor...  Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
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I get ya ! ...any idea what could be triggering the fault then ? Car was fine until today until it started idling at 900rpm...that only stopped after I restarted car then fault appeared..only thing I've done to the car before it appeared was to leave a daft phone charger in the cigar socket for a few hours to see if its led switches off after cars asleep...obviously not related...do you think its worthwhile doing a battery reset? Cheers pete

That's odd, I did the thermostat hack / upgrade and I get this fault now,

0x48C Electric thermostat circuit fault

Regards ______________________________
Simon
______________________________

Range Rover Classic 3.5 efi - Gone
Range Rover Classic 3.9 efi - Gone
Range Rover Classic 4.2 LSE - Sadly gone
Land Rover 110 3.5 - Gone
Range Rover P38a 4.0 SE - Pleased it's gone
Range Rover P38a 2.5 DHSE - Just sold
Range Rover L322 4.4 v8 Petrol - Current

It could be a fault within the thermostat but I doubt it, I really wouldn't worry about it and I doubt it has much to do with the engine revs, mine tends to wander around on these cold days, I recon it's something to do with the different air density as the temp drops but that's just my own theory...

As long as it pulls cleanly then I'm happy...  Pete

__________________________________________________
2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Funny you should say that..its been damp and freezing up here today.. Worse day if the year and this fault shows. Will keep an eye in it anyhoo...thanks gents

Have you had a look inside the thermostat plug? There's been posts on here about them melting and corroding inside near the contacts causing faults.

Regards ______________________________
Simon
______________________________

Range Rover Classic 3.5 efi - Gone
Range Rover Classic 3.9 efi - Gone
Range Rover Classic 4.2 LSE - Sadly gone
Land Rover 110 3.5 - Gone
Range Rover P38a 4.0 SE - Pleased it's gone
Range Rover P38a 2.5 DHSE - Just sold
Range Rover L322 4.4 v8 Petrol - Current

I'm going to have a peak at the weekend when I'm off...is it easy to access plug or do I have to remove the air plenum ect ?

Probably best to remove the plastic engine cover and the air intake pipe from the air filter housing, not even a two minute job  ______________________________
Simon
______________________________

Range Rover Classic 3.5 efi - Gone
Range Rover Classic 3.9 efi - Gone
Range Rover Classic 4.2 LSE - Sadly gone
Land Rover 110 3.5 - Gone
Range Rover P38a 4.0 SE - Pleased it's gone
Range Rover P38a 2.5 DHSE - Just sold
Range Rover L322 4.4 v8 Petrol - Current

Brilliant! Will check that just to be sure...thanks