Fault Code List, Trouble Shooting and Fixes

[apcdetail]

Hello all, I recently acquired a 2011 A4 2.0t quattro with a friend of mine. We do not know the history of the vehicle so it's hard to say what was happening before it decided to give up. The car will crank but will not start, I'm not sure what it is supposed to sound like when it's turning over but it sounds weak and doesn't really show any desire to start aside from a couple little burps here and there. We're trying to source some issues and get this thing running again. So far we have found the following codes and I will list a few things that we have done as well. Any help you guys could offer would be great!


2011 A4

143k miles

16706 P0322 engine speed sensor-G28: no signal Error
16708 P0324 knock control
16394 P0010 Series 1: failure of the regulator valve timing
16705 P0321 engine speed sensor-G28: implausible signal
16727 P0343 Camshaft position sensor => sensor-G40: too high signal



We replaced the Oil Cap (old one was leaky), spark plugs, Camshaft Position Sensor, Crankshaft Position Sensor. We checked to see if we were getting fuel on the low pressure side and there was fuel at the engine, we also checked for spark and there was no issue there. Thanks in advance for any info you guys/girls can offer!

[audrobotic]

My A4 has a fault code:

00657 Center Vent Adjusting Motor (V102).

Is this something to worry about? I haven't really noticed anything amiss, but I guess I'll pay more attention now that I know there's a code.

[guppie_boi]

I bought my 2012 Audi a4 Quattro not to long ago (around 3 months ago) on facebook marketplace and right after I bought it I got the code p2188 (system too rich at idle bank one). I have been trying to fix it for months now but I can’t figure out what the problem is. Here’s what I’ve done to my car so far:
- [x] New PCV valve
- [x] New spark plugs
- [x] New fuel injectors
- [x] New intake manifold gasket
- [x] New High Pressure Fuel Pump
- [x] New Cam follower
- [x] New coolant
- [x] Oil change (4-28-23)
- [x] Replaced engine filter
- [x] Replace cabin filter
- [x] Added Freon
- [x] Cooling Fans
- [x] Radiator
- [x] Cleaned MAF sensor
- [x] New oxygen sensor (upstream)

I have noticed terrible mpg (around 8-9). I think my engine is sluggish but I’m not sure because I don’t know what a normal engine feels like. And when I start the car after letting it sit for a day or two it cranks doesn’t turn on the first try. Usually starts after the third try. I also have very high long term fuel trims (around -18% ~ -21%) I am really lost at this point it’s starting to feel hopeless because of the amount of money I have spent trying to fix a car that I thought had zero problems.