Audi A4 1.9 TDI 2005 - Advice needed please

[munnauk]

HI all

I have a Audi A4 1.9 TDI 2005 , and would like some advice please with issues im having .

Mileage 146K

Basically appx 1 year ago noticed the water level in the expansion tank was low , so i topped it up and thought nothing of it . I have owned the car for 5+ years and have never ever needed to top the water or oil in between services . Its been a amazing car .

Then a month later the coolant light came on and i had to top the coolant up again . It seemed strange , i got the car checked out and no mechanic could find any visible leak . I have changed the cap and expansion bottle to rule them out. Also, I have noticed that even after not using the car for a day, when I remove the coolant cap, there is a lot of pressure in the system.

Anyway fast forward I've been laboring on with it , and now i have to top up every other day .

Also now today i started the car this morning and it ran really rough . i gave it a rev and eventually it revved up and billowed a big white cloud of smoke .

Now emission sensor light is on and car is in limp mode permanently .

Any ideas what issue i might have ??

[bill.wj.wilson]

Get a sniff test done, usually if coolant is leaking you can see the residue on the joints or unions, from what you're describing it could be a head gasket or a cracked block, but that test will confirm an issue, basically it changes colour if it detects oil or exhaust gases. Gives you a better clue at least and shouldn't cost a fortune.

Sent from my SM-G965U using Tapatalk

[munnauk]

Many thanks for your message. I think you're right in that it is a head gasket or cracked block. I've got a mechanic coming to look at it on the weekend. Hopefully should get it sorted

[arman123]

Get the EGR cooler checked that could be leaking i don't think it could be cracked block or head gasket but you never know is the engine code BRB.

[mumutley]

Many thanks for your message. I think you're right in that it is a head gasket or cracked block. I've got a mechanic coming to look at it on the weekend. Hopefully should get it sorted

Any news on the fault?