P0299--New OEM Turbo Assembly
This is round two. Another tech replaced turbo with OEM part. Apparently had all the "sensors" on it. It returned today with P0299. We only have a Verus which is at 19.2. I'll add some pictures of some data pids i watched at idle and on test drive. I noticed Actual charge pressure versus Specified at idle doesn't come close to matching. Actual 990 mbar vs Specified 470. Under load Actual 1250 vs Specified 1190. Ran Sequential Actuator Test and got a ton of shorted to power codes. Not sure this is even a valid test though.
Are the sensors installed in the correct spots and are the wiring harnesses plugged into the wrong places? Look for harnesses that look stretched or laying at weird angles. Go to audi parts dept and ask for a picture of how the harness is supposed to go from place to place.
Vehicle came in about 20 minutes before end of shift. Soon as i saw the difference in Actual & Specified Boost I suspected either boost pressure sensor issue or a lying Snap-On tool. The Verus won't even clear the codes. Had to use my $50 Creader...so I'll get a better look at it Thursday. Our smoke machine is broke. Brake lathe is too...corporate bullshit.
I would check that the wastegate linkage is adjusted properly and nothing is binding.
Ck backpressure. I have seen converters clogged enough to cause low boost with no code. If you don't have a backpressure sensor, pull the forward O2 and drive it to see if the power is back.
Had a VW with that issue. Crazy a converter would melt down in 62K miles. But stuff happens.
Yuo You need some other than snop on tool . Live data will help
Main question right now is where should Actual Charge Pressure start at in mbar? If PCM says "Specified" is 470 and Actual is reading 990 that seems to indicate the sensor is skewed? I do have OBDEleven program on my phone. The above pictures were taken from live data.
Sensor or wiring, also check values on all air pressure sensors and air temp sensors check with ignition on and at idle ;
Gail your pressure reading at idle (470/990) is not a issue it's a normal reading. Also not real concerned about the difference of … However 1250 mbar is low on pressure for this turbo system. You should clear faults and drive again while graphing boots actual vs desired. (Boost will be limited with faults stored) Furthermore either smoke or pressure testing of all turbo piping and…
I've thought about buying VCDS. Do i want Hex-Net Pro? Don't do a lot of VW/Audi but would really like to have an accurate tool for those few. Or would an Autel or Diagun be a fairly reliable alternative to the Verus for these?
Very smart. Get the professional version. You wil liked
hex net pro I tend to live it in cars I would suggest the usb version or just use hex net via usb
The nice thing about VCDS is it's a great tool and it's not super expensive. It also has free updates. However, if you don't do many VW/Audi products, it's not worth it. I would then suggest a Cardac-m or something like it which, with the proper subscription, acts like a OEM scan tool on pretty much all cars. If that's not what you need then go for what you use the most.
The tech that changed the turbo says he told them the convertor was starting to melt down when he removed the turbo. Warranty company and manager said replace turbo. So now they trying to get a converter. I ordered a back pressure gauge and a smoke machine. You really have to have you own tools you think you might need. PEPBOYS won't keep them in good working order. Too many hacks tearing stuff…
drive the vehicle along a brick or cement wall with the passenger window down a little bit. Get on the throttle and let off. listen for a rattle. That rattle is the waste gate flopping around. Audi had a TSB for some of these turbos. It essentially involved putting a thin-ass clip in the linkage. Step 1 of the TSB is "remove the turbo"...... Replace the turbo at that point. Good Luck