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I have a 2002 1.9l tdi that had an oil change,new battery , fuel filter and egr valve changed. The code 1556 is coming up. I don't know where to search for help with negative pressure intake or exhaust. O'REILLY'S couldn't locate schematics for sensor etc. Where do I go from here? Has anybody had this issue? It has more power now and is getting 40mpg vs 33mpg.
 

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Your turbo is not working. Vacuum leak or plugged intake or leaking vacuum turbo actuator.

Here is the low power check list, go through it.


 
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