what do you think about this sensor?

http://www.ebay.com/itm/2003-2010-Ni...2015fb&vxp=mtr

 

what do you think about this sensor?

http://www.ebay.com/itm/2003-2010-Ni...2015fb&vxp=mtr




p.s. Previously I had O2 errors on all sensors stored in ECU. Fuel efficiency was 10.69mpg (22l/100km) in city.

It has been fixed for now and mpg is raised to 14.70mpg. Is it normal or not?

 

The eBay sensor will work, I got one and so far so good. One of the guides will need to be shaved off in order to plug in, you'll see what I mean once you have this sensor next to the OEM one.

You should also replace the harness, you can get it from Z1 Motorsports.

Once you have it fixed you should feel the restored power, and your MPG should also improve.

 

Thanks a lot!
My V6 Audis have 2 sensors (as I remember), VQ has only one?
And can you advice me a gaskets? (because I need to remove intake manifold)

 

Yes our VQ has only one knock sensor, just check the pics in previous posts.

You can replace the gaskets. I reuse mine, though, I cleaned the mating surface thoroughly and made sure there's no sand/debris stuck in between before putting everything back, so far so good, no leaks.

 

Just replaced my knock sensor and harness. Was prety difficult just unplugging the sensors but the rest was all bolts n nuts. Took me 5 hours for everything start to finsh.but then again I am a noob at all this, but couldnt stand to take it to a shop n get charged over $400 so proud of myself :-) and definitely feels much better as far as power goes.