Running rich P0172 code on 2003 Audi A4 1.8t quattro

Question

Have a 2003 Audi A4 1.8t quattro. Still getting a P0172 code after changing both O2 sensors, coolant temp senor, n75 valve, MAF sensor, and diverter valve. Also checked for air leaks and none. What am I missing for me to be running rich?

Answer 1

P0172 Fuel trim system too rich

This is VAG code 16556, You need to make sure the suction jet pump is not clogged, If it is a replacement will be necesssary. There is a TSB for this 01 08 13 titled Fuel system - Mil on multiple fuel trim DTS set.

Comments

Thanks for your help Reynaldo but I just took off the suction jet pump and it seems to be clean and clear of clogs.  Air passes thru with no problem.  Whats next? Could this be leading to a bad or clogged Fuel Filter? Anymore advise is appreciated.

Thanks

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Clogged fuel filter will not set a rich bank, you will get random misfire with a lean bank code, Usually a rich bank is mechanical such as low compression. any false air leak will cause a lean code, so there surely is no vacuum leak, The sparkplug condition should be looked at, P0172 is fuel rich .