RS4 B8.5 2014 - Cooling problem

4.2 V8 32v FSI - 444 bhp
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TheBigFish
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Joined: Fri Dec 02, 2022 11:17 am

RS4 B8.5 2014 - Cooling problem

Post by TheBigFish » Fri Dec 02, 2022 5:14 pm

Hi guys,

I'm a newbee here. First post. I hope it's I've posed in the correct place!

After really wishing to own an RS4 for about 10 years I finally have one! Great to be part of the RS club :-)
Its a 2014 model in Daytona Grey, just a baby with 48K miles. She was cheap and has a couple of issues, I don't believe big ones. Here is the VCDS read out - I wondered if someone could maybe point me in the right direction and I'll get the tools out :-)

Thursday,01,December,2022,12:37:04:57579
VCDS Version: Release 22.10.0 (x64) Running on Windows 10 x64
www.Ross-Tech.com

2 Faults Found:

8113 - Performance Malfunction in Cooling System
P2181 00 [237] - -
MIL ON - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 4
Mileage: 76238 km
Date: 2022.10.30
Time: 17:24:00

Engine RPM: 2385.00 /min
Normed load value: 24.7 %
Vehicle speed: 57 km/h
Coolant temperature: 66 °C
Intake air temperature: 29 °C
Ambient air pressure: 990 mbar
Voltage terminal 30: 14.182 V
Unlearning counter according OBD: 40
CAN status - engine control module-Bits 0-7: 0
CAN status - transmission control module-Bits 0-7: 0
CAN status - brake control module 1-Bits 0-7: 0
CAN status - brake control module 2-Bits 0-7: 0
selected gear-Bits 0-7: 4
Cruise control switch actuation-Bits 0-7: 0
Cruise control switch actuation-Bits 0-7: 0

2838 - Fuel Rail/System Pressure
P0087 00 [096] - Too Low
Intermittent - Not Confirmed - Tested Since Memory Clear


My questions are as follows:

1) The cooling issue fault keep coming back afgter clearing the fault. I read another thread and this seems to be a common fault? I'm thinking either thermosat or coolant temperature sensor? Someone also mentioned common fault witrh thermostat sensor (is this the temperature sensor?). Do I need to remove the front bumper and radiator to change thermostat and temp sensor? Maybe someone could point me in the correct direction on where I should look, if I can trest with my VCDS, any easy parts to change first without having to remove bumper etc (maybe a sensor?) and part numbers I would require?

2) The fuel rail/system pressure fault - can we tell off this fault if this is low pressure or HP side? If LP then maybe a fuel filter might resolve this? I have had an issue where the engine hunts when cold at start-up when for the first 20 seconds when the secondary air injection pump is on. Either seems to be fuel starvation or not getting wenough air into the engine (maybe its getting sucked by the secondary AIP instead?). When the Secondary AIP goes off there is no more hunting and all is well.
If this is a problem on the HP side, then I'm guessing this could be a problem either with an HP pump or injector. Again, is there a way to test?

The other issue I've had twice is a misfire on the engine. It's only happened a couple of times when changing gear and driving harder at higher revs.

Many thanks for an support with fault finding! :-)

Cheers,

Ben

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