I have a 2002 VW Jetta TDI and am problems with turbo.

If you mean by fails to respond there is no pick up, but the vehicle moves relatively slowly, sounds like the turbo may be toast, or the vacuum hose for the turbo has a leak

If you are getting boost, your turbo is likely not blown. There is a banjo bolt connection for the turbo oil. If it has loosened, then it would be leaking oil on the outside of the turbo. A blown turbo leaks on the inside (I believe, though not positive).

I don't have a TDI, but have a VW 1.8T with a turbo I recently replaced.

There is really nothing to fix other than to replace the turbo. It is not a tough job (at least the 1.8T wasn't) though it took 11 hours to complete. So you should try to get the oil leak fixed (near too much heat to ignore) but should likely only need to replace if it's not providing boost, or making strange sounds.

Replace the Engine Coolant Temperature (ECT) sensor. ECT sensor is placed in the right back side of the cylinder head on 2002 VW Jetta 1.9 TDI. See picture below:



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1993-2005 Volkswagen Jetta, Golf, GTI, Cabrio (A3-A4) Hatchback & Sedan Workshop Repair Service Manual - 350MB PDF

1993 2005 Volkswagen Jetta Golf GTI Cabrio A3 A4 Hatchback Sedan...

This is a COMPLETE Service and Repair Manual for your 1993 1994 1955 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 VW Jetta, Golf, GTI, Cabrio (1.8L turbo, 1.9L TDI and PD diesel 2.0L gasoline, 2.8 LVR6) (A3, A4 Platform) Hatchback & Sedan. It covers every single detail. All models, and all engines are included.

This QUALITY manual is 100 percents COMPLETE and INTACT, no MISSING/CORRUPT pages/sections to freak you out! Detailed illustrations, exploded diagrams, drawings and photos guide you through every service repair procedure. This manual can be viewed on any computer, as well as zoomed and printed. All repair procedures are covered A-Z. This manual for VW Jetta, Golf, GTI, Cabrio makes any repair job easy to do with very easy to follow step-by-step instructions & pictures on all areas of repair.

1993 1994 1955 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 VW Jetta, Golf, GTI, Cabrio (1.8L turbo, 1.9L TDI and PD diesel 2.0L gasoline, 2.8 LVR6) (A3, A4 Platform) Hatchback & Sedan
===========
Format: PDF
System: All Versions of Windows, Mac, iOS, BB, Android, etc..
Requirements: PDF Reader.
Printable: Yes

TABLE OF CONTENT (example)

GENERAL INFORMATION *

ENGINE *
engine mechanical
engine lubrication system
engine cooling system
engine control system
fuel system
exhaust system

TRANSMISSION/TRANSAXLE *
clutch
manual transaxle
automatic transaxle

DRIVELINE/AXLE *
front axle
rear axle

SUSPENSION *
front suspension
rear suspension
road wheels & tyres

BRAKES *
brake system
parking brake system
brake control system

STEERING *
power steering system
steering system

RESTRAINTS *
seat belts
supplemental restraint system (srs)

BODY *
body, lock & security system
glasses, window system & mirrors
roof
exterior & Interior
Instrumental panel
seat

AIR CONDITIONER *
air conditioner system

ELECTRICAL *
wiring diagrams
starting & charging system
lighting system
driver information system
wiper, washer & horn
body control system
lan system
audio visual, navigation & telephone system
auto cruise control system
power supply, ground & circuit elements

MAINTENANCE *
maintenance

INDEX *
alphabetical Index

1993 1994 1955 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 VW Jetta, Golf, GTI, Cabrio (1.8L turbo, 1.9L TDI and PD diesel 2.0L gasoline, 2.8 LVR6) (A3, A4 Platform) Hatchback & Sedan

you probably need to get the feul common rail tested, the diesel pumps are also known to give trouble on that model car

The bearings and seals in the turbo are going bad, so oil is getting burned with the fuel.

chances are your turbo pipe has come off near the back of your drivers side headlamp, where it gos into the inner wing to the intercooler. hope this helps

i think that you have to check the turbo for leak oil or problem after rebuild

My Pop's 2002 VW TURBO JETTA leaks oil inside exhaust. What possibly could be wrong?

should be able too but see if can check numbers on them to clarify as there are a few variations.