Galbro

Help needed!

My A6 has this fault "Thermostat for cylinder head - open circuit" fault code P199E from Ross tech diagnosis machine but I can't find the code on Ross tech wiki. I've replaced the thermostat along with some other stuff along the way but still no luck.

Any input would be greatly appreciated

Dangerell

I have the same problem, i replaced the entire oil filter housing and nothing changed.

I already made also a topic for this, you can follow up there, maybe we will find the answer.

https://www.audiworld.com/forums/a8-...oblem-2969800/

KevinGary

What engine do you have? Year? Mileage? Location?

Galbro

Hi I've got mine sorted after replacing alot of parts. When I return to the car I will take a picture of the part I had replaced. (Its easily accessible).

Dangerell

Great!

Looking forward to see what worked for you.

Dangerell

Any news regarding the parts you replaced to fix the problem? As i replaced another sernsor and the connectors and still the error wont go away. ) Thanks!

Galbro

Hi mate, sorry for the delay. I've been out of the country just got back this morning. I've attached a few pictures of the part that resolved the issue for me. I had numerous parts changed relating to the thermostat with no luck. My VCDS had given me the same fault as yours which nobody seemed to know a fix for. I gave up and went to a main dealer where they diagnosed this and replaced it for £200. Hope this gets you sorted aswell

Dangerell

Hi,

Thanks for the reply.

You dont have the part names / codes on the invoice.. to ease the search?

I bought also today 3 parts related to the problem... )

059 121 737 AM - regulating valve
059 121 506 H - intermediate flange
059 115 291 B - thermostat

Galbro

Hi mate,

The part that done it for me was a pressure converter. Part no. 059 906627L

I really hope this sorts it for you!!

Dangerell

Ok great, thanks for the reference. I found it, i will order this also, hope it will fix this as im also fed up changing parts after parts with no result.