Hi
I'm new to this forum so thanks for the the ease of sign up.
I recently bought a 2014 A6 Allroad BITDI. I'm really please with it generally but it has what I believe is a fairly common issue of a lumpy/rough idle when cold. It's intermittent, just a bit of a stutter and just at idle up to around 1300rpm. It completely disappeqars when warmed up. The car has done a little over 124000 miles.
I know that a common cause is a gummed up EGR valve but before I look at removing and cleaning it, could this be the issue?
Th readings were taken with the engine switched off and cold, just ignition on.
The exhaust gas temperature and temperature sensor after EGR cooler values seem to stand out to me, but is this normal?
Thanks, Owen
Saturday,03,October,2026,11:55:45:46684
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 26.9.0.3 (x64) HEX-V2 CB: 0.4713.4
Data version: 20260828 DS378.0
www.Ross-Tech.com
VIN: WAUZZZ4GXEN167059 License Plate:
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Address 01: Engine (4G0 907 589 E)
11:55:32
IDE00025 Coolant temperature 20 °C
IDE00196 Engine oil temperature 20.1 °C
IDE00348 Intake air temperature 18 °C
IDE00973 Outside temperature 18.0 °C
IDE02229 Exhaust gas temperature sensor 1 25.4 °C
IDE04255 Temp sensor for EGR after cooler: raw value 23.7 °C
IDE04396 Exhaust gas temperature S4-B2 16.1 °C
I'm new to this forum so thanks for the the ease of sign up.
I recently bought a 2014 A6 Allroad BITDI. I'm really please with it generally but it has what I believe is a fairly common issue of a lumpy/rough idle when cold. It's intermittent, just a bit of a stutter and just at idle up to around 1300rpm. It completely disappeqars when warmed up. The car has done a little over 124000 miles.
I know that a common cause is a gummed up EGR valve but before I look at removing and cleaning it, could this be the issue?
Th readings were taken with the engine switched off and cold, just ignition on.
The exhaust gas temperature and temperature sensor after EGR cooler values seem to stand out to me, but is this normal?
Thanks, Owen
Saturday,03,October,2026,11:55:45:46684
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 26.9.0.3 (x64) HEX-V2 CB: 0.4713.4
Data version: 20260828 DS378.0
www.Ross-Tech.com
VIN: WAUZZZ4GXEN167059 License Plate:
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
Address 01: Engine (4G0 907 589 E)
11:55:32
IDE00025 Coolant temperature 20 °C
IDE00196 Engine oil temperature 20.1 °C
IDE00348 Intake air temperature 18 °C
IDE00973 Outside temperature 18.0 °C
IDE02229 Exhaust gas temperature sensor 1 25.4 °C
IDE04255 Temp sensor for EGR after cooler: raw value 23.7 °C
IDE04396 Exhaust gas temperature S4-B2 16.1 °C
