Engine coolant bypass valve control circuit open!!!!

[RedStallionA3]

P2681 how do I fix this code ??? Is it the thermostat / waterpump or is it something simpler then that?? I've been without my car for days and I'm getting over it

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[evo v]

I need to check my old scans to see if the error is the same but on my A3 8V I had to replace one of the auxiliary water pumps. It was on the back of the engine underneath the turbo. It is wrapped in a blanket. It doesn't affect how the engine runs. When is bad you will feel change in interior heating output with change of the engine rpm's.

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[RedStallionA3]

I need to check my old scans to see if the error is the same but on my A3 8V I had to replace one of the auxiliary water pumps. It was on the back of the engine underneath the turbo. It is wrapped in a blanket. It doesn't affect how the engine runs. When is bad you will feel change in interior heating output with change of the engine rpm's.

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Wait wait whaaaaat so my issue might not even be a thermostat/waterpump issue ? I need to know cuz I already bought a thermostat/waterpump housing (can be returned) but i know in that area ur talking about I may have issues that I couldn't figure out what it was but I do know that inside my car it gets really hot more then normal

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[evo v]

Soo... I found some old logs. I had 2 errors P15446 and P2681. The first one I fixed by replacing the pump on the back of the engine. The second - by replacing the valve on the driver side of the engine. It is tucked under the air intake pipe going to the turbo, above the flywheel. What I read back then was the coolant was leaking through the connector onto the pins causing them to rust. I replaced both the connector and the valve.

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[MikTip]

When you changed the radiator...was all the air removed while filling the new radiator and system?

Cause your whole issue there might just be air in the system.

[RedStallionA3]

When you changed the radiator...was all the air removed while filling the new radiator and system?

Cause your whole issue there might just be air in the system.

I did not and was told that

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[RedStallionA3]

So rent one of those radiator kits ?

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[MikTip]

So rent one of those radiator kits ?

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Google is your friend!

Google how to bleed the air out of Audi A3 radiator when filling coolant.

[RedStallionA3]

OK after getting all the air pockets out and changing my battery to a agm battery the coolant fault codes are gone wen scanning car but turbocharger boost control position sensor circuit range/performance fault code p2563 is coming up? Anyone have any idea what this may be ?

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[MikTip]

OK after getting all the air pockets out and changing my battery to a agm battery the coolant fault codes are gone wen scanning car but turbocharger boost control position sensor circuit range/performance fault code p2563 is coming up? Anyone have any idea what this may be ?

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Yes I have a clue...

Locate and verify the connections on the boost sensors. Otherwise known as MAP(Mass Air Pressure) sensors. 2 of them One on the intake...one on the boost line going into the throttle body down low near the ground.



You probably did something to one when the radiator was changed...



#21 Right next to the radiator!

[RedStallionA3]

Leak going into the engine from coolant hose. Doesn't leak until coolant boils 20221010_184402.jpg

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[MikTip]

Leak going into the engine from coolant hose. Doesn't leak until coolant boils 20221010_184402.jpg

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Very common issue...

Vent Tube Adapter - Audi 06K-121-143

Easy fix to simply replace

[MikTip]

https://www.emdauto.com/products/emd...40092390850743