My check engine light lit up recently. The codes are 17965, 17544, 16825, 16684, 16687, 16688.

I changed the valve check valve for purge system at the air box; replaced the crankshaft vent breather hose assemblies; pcv valve; unions and vacumn line.

It ran for 30 miles and I got another check engine light. Any idea what I should look at next? I could use some advise!

DEBlueHen
1999 A4 1.8T Quattro

 

Check your MAF, it could cause your problem...disconnect it, if the maf is reading to high it will indicate a boost leak and cause your code.

If you have a registered VAGCOM log the engine measurement blocks that show airflow and boost during an acceleration run to see what is happening when the code is logged.

 

Try this link for codes and solutions

http://wiki.ross-tech.com/wiki/index.php/Main_Page