2001 audi a4 1.9tdi small turbo/vacuum pipes mixed up

code p 2195 refers to heated oxygen sensor(HO2S) 1 bank 1--signal stuck lean===causes --HO2S---fuel pressure --injectors---intake leak
also --HO2S 1 bank 1 implausible signal====causes ---wiring---short to positive ---short to ground ---HO2S--- ECM for that code I would be replacing the HO2S and checking the intercooler for a split to loose boost pressure
code p 2099 refers to post cat converter fuel trim bank 2 --too rich====causes ---cat converter
it also refers to engine coolant temp sensor (ECT)--circuit malfunction===causes wiring---ECT sensor

Audi A4 1 8T blown turbo

VW B5 1 8T AWM Passat Bad Turbo

Check for vacuum leak first. Most likely cause.
You can also run a throttle body adaption (with VAGcom).

check for blockages in the air filter system. replace the air filter. The only way that oil can get in to the turbo inlet hose is if the turbo is running in a vacuum and sucking oil fast the turbo seals Unless the turbo bearings are shot.

check if your catylac converter if plugged and also for vaccum leaks. those two things are the most likely reason its doing that if not then get back to me

WHAT YEAR ????

There are several possible faults:
1. Pressure sensor is faulty (it might come up on diagnostics as if it was working fine, but it shows the wrong manifold pressure).
2. Either one of the boost pipes/hoses or the intercooler have a hole somewhere.
3. Turbo's actuator is stuck.
4. Vacuum hose is damaged which goes in to the turbo actuator.
5. Control valve for the turbo actuator is not working properly.

you might have a clogged oil line(s) to the turbo not allowing sufficient oil flow to the turbo remove the lines clean with carb cleaner clean the inside of the turbo be sure to scrape off burnt oil....change your oil and see if that works

If somebody replaced the turbocharger with a new one, you must check up all command vacuum lines, the entire air intake system (air pressure pipes, intercooler, connections, EGR - throttle vane, ...), and also turbocharger and EGR command solenoid valves (three pieces). Could be also MAF sensor defective! Here you have the vacuum air pipes connection picture for Audi A4 1.9 TDI (AJM engine):
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Yes, you have to do this and yes it is a pin, would highly reccommend taking this to a ASE certified local mechanic who speciallizes in AUDI NOT a dealership