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#1
7th May 2025, 10:44 AM
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Temp Gauge Moving
Hi All,
My car is due a fresh MOT soon so I thought I would take it for a pre MOT check. It passed on everything except the emissions which were CO2 at 0.6 and needs to be 0.3. The car just had an oil service and there is a slight coolant leak but nothing major. I was advised to change the air filter, which I did, and add Cataclean to fuel system! So I added Cataclean to ¼ tank, drove for about an hour (35 miles) added £40 worth of Esso Premium fuel as I thought this would help clean the engine, drove back same distance but about ¾ of the way temp warning came on with gauge very high, over 110. I pulled over, checked under the bonnet, coolant level was fine and didn’t seem excessively hot, waited a while then drove home, warning light gone but temp sitting over a 100 all the way. Now when I drive car temp stays at 90 for half an hour then start creeping up and down between 95 and 110, usually at the higher end at speed and lower end in town! I’m sure this never moved before as it was always just on 90. I haven’t driven it more than an hour since. Should I be worried?... I am and don’t want to drive her long distances which I why I got her? Also I didn’t change the CO2!  If anyones has any advice or experience of this it would be much appreciated. Thanks
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2002 S8 in Blue with Light Grey Interior with Ski hatch. Xenon Plus headlights, 18in Avus Alloys. 
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#2
7th May 2025, 11:18 AM
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Could it be a faulty temperature sensor?
That might also meddle with the fuelling so not help with the fuel/air mixture etc.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#3
7th May 2025, 11:29 AM
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Cheers HP, I did think about that but the car seems to be running fine. I was going to change the sensor if i can and fresh coolant at the same time.
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2002 S8 in Blue with Light Grey Interior with Ski hatch. Xenon Plus headlights, 18in Avus Alloys.
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#4
7th May 2025, 03:00 PM
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Quote:
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure
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#5
7th May 2025, 08:09 PM
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Yes, it was doing overtime!
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2002 S8 in Blue with Light Grey Interior with Ski hatch. Xenon Plus headlights, 18in Avus Alloys.
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