hardipk5

i found some codes off my 95 90 quattro sport. (listed below) i was thinking or hoping maybe it was just the 02 sensor causing this problem (decreased power, eating gas, hesitation accelerating/under load.) i was wondering the best way to test fuel pressure as i could not find a value near the injectors that i could tap into to test. Is the usual way to test is to use a T from the fuel pressure regulator? also what is a good range of pressure? i was hoping to see if my fuel system was still operational. does anyone have some insight on this maybe? i check the IAC,cleaned MAF sensor, replaced all vacuum lines i could find in the engine tested battery and alternator. if anyone has a clue what could be wrong id be VERY thankful. been driving the car like this to school... im going to be replacing the 02 sensors regardless but would like to know if im going in the correct direction.

Codes:
17514 - 02 sensor B2-S1 voltage too low - air leak
16534 - 02 sensor malfunction B2-S1
16539 - 02 sensor heater circuit malfunction B2-S1
16785 - EGR flow insufficient
16558 - Fuel trim - system lean Bank 2
16557 - Fuel trim malfunction Bank 2

hardipk5

Was advised to block EGR with a plate and replace 02 sensors. Will be most likely doing that after the snow storm here.

hardipk5

Issue was solved, coil packs went bad and two cylinders were dead. replaced coil pack under warranty. (Had them two years, 3 year warranty!)

Rusty Spokes

Good work finding the solution!