Hi All,
Purchased a 2nd hand 2015 model SQ5 about 6 months ago, just 3 years old and 28,000km with full service history. All has been fine up until a few days ago when the joy of seeing a check engine light ruined my day. Scanning with my Carista dongle the ECU is telling me that i have the following issue:
P2006
Intake manifold runner control stuck closed bank 1.
Upon Googling, i can see this type of error is pretty common on the single turbo 3.0T V6 TDI engine in the normal Q5/A6 etc, but have not been able to find any information relating to the bi-turbo engine used in the SQ5 (and several other Audi models such as the A6). The inlet manifold design is also different on these 2 engines.
I cleared the error code to see if it was a one-off or if it would come back again, and it came back again the following day.
So on the weekend i decided to pull off some intake bits and see what i was dealing with - to my surprise the intake pipe, throttle plate assembly and intake manifold (all located after where the EGR is plumbed into the intake) had a thick layer of soot/carbon junk on them....no wonder i was getting the error!!!
I knew this was an issue with modern diesel engines and emissions targets but wasn't aware it would be this bad with only 35,000km.
Anyway, with a combination of petrol, degreaser spray and a soft wire brush these parts are looking much cleaner and the error has not re-appeared.....yet.
I have since purchased a can of Liqui-Moly diesel intake cleaner which i will run through the engine sometime this week. I am also going to look into the possibility of an EGR delete (either physical or ECU coded delete) to stop this from happening again.
Before:
After (not perfect but much better). I also cleaned the plastic pipe leading to the inlet manifold and scrapped out the inlet manifold as best i could but didn't take pics as my hands were pretty grotty by then:
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