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When my 2009 Jetta TDI check engine light came, I took it to my nearest VW dealer - about 100 miles away. $450 spent, and they said some kind of exhaust flap was stuck, and they replaced it. Within a month, the CE light came on again. Didn't want to drive 100 miles and get stuck up for another $500 so I purchased an OBD reader, and the code is PO47A. Apparently has something to do with the exhause pressure sensor. I ordered one, and repaced it myself (about $85) and cleared the code. After driving for about 10 miles, the CE light comes back on, and the error code is again PO47A. My repair manual for the car has codes for PO47B, PO47C and a few more, but no PO47A. the car runs just fine as it is, but I want to make sure there is nothing serious going on.
CODE PO301 - CYLINDER NUMBER 1 MISFIRE DETECTED. POSSIBLE CAUSE- BAD COIL - SPARK PLUG - INTAKE MANIFOLD VACUUM LEAK - DIRTY OR FAULTY FUEL INJECTOR. CODE P1142 - DID NOT SEE. CODE P1545 - THROTTLE VALVE ACTUATOR MALFUNCTION.POSSIBLE CAUSE THROTTLE VALVE CONTROL MODULE FAULTY - THROTTLE VALVE IS DAMAGE OR DIRTY - THROTTLE VALVE MUST BE IN THE CLOSE POSITION - ACCELERATOR PEDAL OUT OF ADJUSTMENT. THROTTLE POSITION ACTUATOR IS SHORTING TO GROUND OR POWER.
if you can do it yourself get under the car and make sure that the pan bolts are tight if they are look for any hoses going to and from trans make sure that they are all connected and tight even though the fluid never has to be changed there is still a fill tube make sure that the end of the tube that goes into the tranny is secure and tight being that you had alot of engine work done its possible that one or all of these things could be wrong could have inadverntenly loosened it up and forgot to retighten. hope this at least gives you a starting point.
try using the remote unlock - then press the remote lock. This works on my 2000 jetta tdi. VW dealership told me $450 job to change door latch and $45 to figure out if it is the latch or the NEW key they programmed a few months ago. By the way - is yours a NEW Key?
My '01 TDI had the same issue and apparently it was a switch gone bad behind the horn and airbag. . . so no idea if the airbag would have worked had I been in an accident. Definately worth going to VW and having it looked at though. Better safe than sorry.
find your local vw service center and see if they can plug their computer in to see if there are any codes on the cpu. there may be one for an intermitent for the turbo. i ran into the same problem last month and it was the turbo veins are sticky so occasionaly it lack power going up hills. it did not cause the check engine light to come on, but there was a code on the cpu when they checked it. if it happens again while you are driving, pull over, shut the car off for 10-30 secs then restart it and see if it makes a difference. when it happened to me i called my guy and thats what he had me do and it was like a new car after that.