i finally caved into taking my audi to a mechanic so they could run diagnostic tests that i cant at home.

and...

2 of my cylinders have 15-20 psi instead of the 105 that the others have.

(this is my another thread where i suspected, and hoped, it was a fuel line problem) https://www.audiforums.com/forum/sho...d.php?t=121481

so now i have a few questions if some1 wouldnt mind answering

1.) what would cause two cylinders to go out at the same time, and rather than having no pressure, have LOW pressure?

2.) assuming fixing it will cost more than im willing to pay, is there anything wrong with just driving on 4 cylinders (besides performance/fuel efficency)?

3.) both my diagnostic software and the mechanic's gave off several o2 sensor/lambda warnings.. how is that effected by compression? im no mechanic (far far far from it), but if the spark is still igniting the fuel, whats causing the 02 sensors to go haywire?

thanks a bunch