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#1
16th April 2019, 07:46 AM
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Does it seem like it's getting up-to-temperature? (ie engine feels hot, cabin heating still blowing hot). I had similar a similar issue a few years ago that turned out to be just the temperature sensor.
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Mark ------------------------------------------------------ 2002 FE S8 Ebony Black Pearl ------------------------------------------------------  ------------------------------------------------------ Cars Owned: The Tesla Era: 2020 Model S Performance Ludicrous+ (present) (Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability) The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present) The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust 
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#2
16th April 2019, 02:35 PM
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Yes - all appears normal.
I had an A6 a few yrs back and that had a failed coolant temp sensor - the car drove like a dog or even failed to start. It was cheap as chips to replace. Because the A8 is driving normally, I think I've discounted that, but, I'll keep it in mind- what's more, it's cheaper than the thermostat.
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Current: Graphite grey 2016 q7 3.0 (4m) Night blue - 2005 D3 4.2 TDi LWB My pride and joy - 1991 ur 20v quattro (owned since 2003). BMW 645 (Need to sell now I have 2 A8s....) Previous cars A8 D4 4.2tdi lwb (2011) A4 cab 3.0 Quattro petrol (2005) T5 Caravelle exec 2.5 (2006) A8 D2 3.7 quattro sport (2001) A8 D3 4.2 quattro (2003) A6 4.2 quattro avant (1999) A6 2.8 quattro (1998) Audi Coupe 2.6E (1993) Carlton 3.0 GSI
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#3
16th April 2019, 02:54 PM
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Mine drove fairly normally too, if I recall correctly. I suppose it depends on how the sensor fails. If the sensor tells the ECU the engine's hot whet it's cold, I suspect that might cause cold-starting issues due to lack of enrichment. However, if the sensor tells the ECU the engine's cold when it's hot, it might cause the ECU to over-fuel the engine initially, but I suspect that feedback from the oxygen sensors and fuel-trim will compensate for that to some extent.
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Mark ------------------------------------------------------ 2002 FE S8 Ebony Black Pearl ------------------------------------------------------ ------------------------------------------------------ Cars Owned: The Tesla Era: 2020 Model S Performance Ludicrous+ (present) (Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability) The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present) The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
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