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#1
23rd September 2022, 02:30 PM
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Exhaust pressure sensor A
After waiting 6 hrs yesterday, in a remote (ish) location, for the AA to jump start my A8……(no one else around and no jump leads….)
When the car was started, it took much longer than normal to fire up. When I’ve put a generic code reader on it today….it says EXHAUST PRESSURE SENSOR A. Has anyone else experienced this? Is the sensor easily accessible and easy to replace? Cheers
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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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#2
23rd September 2022, 03:15 PM
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For a 4.2 TDI unfortunately no, it's not easily accessible. There are 2 of them, 1 for each bank and they are mounted on the top of gearbox. For access you need to unbolt the gearbox/subframe and lower them. Much easier on 3.0 TDI where it's under bonnet and only 10 minute job to change.
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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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#3
23rd September 2022, 04:16 PM
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Bugger! Wish I had a 3.0 😀
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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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#4
23rd September 2022, 06:17 PM
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I had this many years ago on a 4.2tdi..... got the right run around and not DIY'able for me on my drive, but the outcome wasn't that bad in the end (see post #20)
http://forum.a8parts.co.uk/showpost.php?p=43203 Allowing for brexit and inflation, your costs will likely be higher - but hopefully not the end of the world 
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#5
24th September 2022, 03:24 PM
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Ok - thanks Paul.
As much as I love this car, I find myself chasing my tail with it! The lists of things it needs/wants seems to be increasing.
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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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