P0299--New OEM Turbo Assembly

Gail Technician Garner, North Carolina Posted   Latest   Edited  
Question
Driveability
2015 Audi Q3 Premium Plus 2.0L (CCTA) 6-spd (09M)—WA1EFCFS9FR007414
Low Power

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. 

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Michael Technician
Amherst, Massachusetts
Michael Default
 

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.

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Gail Technician
Garner, North Carolina
Gail Default
 

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.

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Nicholas Diagnostician
Brooklyn, New York
Nicholas Default
   

I would check that the wastegate linkage is adjusted properly and nothing is binding.

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Michael Owner/Technician
Montague, New Jersey
Michael Default
 

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.

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Gail Technician
Garner, North Carolina
Gail Default
 

Had a VW with that issue. Crazy a converter would melt down in 62K miles. But stuff happens.

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Irek Mobile Technician
Central valley, New York
Irek Default
 

Yuo You need some other than snop on tool . Live data will help

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Gail Technician
Garner, North Carolina
Gail Default
 

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.

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Doru Technician
Suceava, Romania
Doru Default
   

Sensor or wiring, also check values on all air pressure sensors and air temp sensors check with ignition on and at idle ;

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Alan Diagnostician
Glenrothes, United Kingdom
Alan Default
   

Is this TFSI

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Bill Owner/Technician
Jackson, Michigan
Bill Default
 

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…

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Gail Technician
Garner, North Carolina
Gail Delay
   

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?

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Irek Mobile Technician
Central valley, New York
Irek Default
 

Very smart. Get the professional version. You wil liked

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Doru Technician
Suceava, Romania
Doru Default
 

hex net pro I tend to live it in cars I would suggest the usb version or just use hex net via usb

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Michael Owner/Technician
Montague, New Jersey
Michael Default
 

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.

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Gail Technician
Garner, North Carolina
Gail Update
 

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…

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Chris Diagnostician
Commack, New York
Chris Default
 

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

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Michael Owner/Technician
Montague, New Jersey
Michael Default
 

Just an FYI Chris. The Op stated it was replaced with a OEM part already. If that's true they have been updated with a slightly different design which supposedly fixes the issue.

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