RayDonovan

my car is 2012 3.0tfsi A6 with almost 100k miles on it and engine is loosing power and it jerks a lot. I scanned it with VCDS and this is what i got. can somebody please help me to figure this thing out?


7 Faults Found:

7119 - Cylinder 4
P0304 00 [101] - Misfire Detected
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 158618 km
Date: 2016.02.12
Time: 09:49:28

7123 - Cylinder 6
P0306 00 [101] - Misfire Detected
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 158618 km
Date: 2016.02.12
Time: 09:49:28

7121 - Cylinder 5
P0305 00 [101] - Misfire Detected
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 158618 km
Date: 2016.02.12
Time: 09:49:28

VCDS
Diagnostic Trouble Code Report
Control Module Part Number: 4G0 907 551 A
Page 2

6371 - Random/Multiple Cylinder Misfire Detected
P0300 00 [101] - -
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 158618 km
Date: 2016.02.12
Time: 09:50:25

7865 - Intercooler Temperature Sensor (Bank 2)
P00A3 00 [040] - Short to Plus
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 158569 km
Date: 2016.01.11
Time: 09:14:56

7818 - Manifold Pressure / Boost Sensor 2 (G447)
P0241 00 [040] - Signal too Low
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 3
Mileage: 158569 km
Date: 2016.01.11
Time: 09:13:29

7948 - Cylinder Disabling
P130A 00 [109] - -
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 158618 km
Date: 2016.02.12
Time: 09:58:10

Readiness: 0000 0000

ihorc

I would probably start with spark plugs and coil packs...

RayDonovan

i swapped it around, still same codes.

snagitseven

Carbon fouling? Are you getting a CEL?

RayDonovan

engine heavily vibrates in idle, heavy vibrating around 1500-2500 rpm, EPC on and CEL keeps flashing... all plugs from bank 1 & 2 look same, no abnormal wear on them.

snagitseven

As I mentioned, it could be carbon deposits if you have eliminated the plugs and coil packs as the cause.

There is an extended warranty to 10yr/120Kmi for 2009-12 3.2L or 2009-13 3.0T engines that will cover carbon cleaning if the cause is deposits in the Secondary Air Ports and an MIL is visible (the SAPs are are down lower in the cylinders). The extended warranty will not cover carbon cleaning for other carbon deposits if in other areas of the engine, i.e. valves, etc. Original owners received a letter in Aug, 2013 detailing this and it states the extended SAP warranty is transferable.

IknowHuhA6

Sorry I am new to Audi engine troubleshooting but based on previous experience the red above is what caught my attention. Spark misfire is only a symptom of potential multiple problems. If you changed plugs already and still have problem... your OBD2 codes are the way to filter down to culprit.

Based on error codes.. if OEM intercooler temp sensor not reading correctly... then car's ECU will assume wrong temperature and could throw engine into a limp-mode to protect engine. This will reduce power because car is trying to keep itself from detonating, i.e. engine knock.

Manifold pressure is the other culprit based on scan. If the sensor is bad or the readings (flow) to sensor have been affected via damaged wire or vacuum hose, the bad readings will also affect timing and fuel delivery thus affecting power.

OBD2 is a great thing. It's a tell-tale to find problem spots sooner. Trick is to learn how to sherlock holmes the failed units and determien if it's the units themselves or something else downstream that's causing the incorrect readings.

These are merely suggestions on where to look. Good luck and keep us posted.

Did you swap (move around) or replace?

BlackR1ce

Not sure if this will help but did you check the gapping of each spark plug to make sure they are at .032 or. 8mm? From what I've read on misfirring of spark plugs is due to wrong gapping and using cheap spark plugs. Can you provide brand of spark plugs?

Thanks

tenspeed

Like IDHA6, I'm still on the bench when it comes to Audi trouble shooting. I looked up the OBD Code P0241 for the Audi Manifold Pressure since it has a higher fault frequency.

The link says:
Possible causes
- Boost pressure sensor harness is open or shorted
- Boost pressure sensor circuit poor electrical connection
- Faulty boost pressure sensor
- Faulty Turbo/Super Charger
- Engine over temperature
- Ignition misfire exceeds the calibrated threshold
- Faulty Knock sensor (KS)

Check it out at P0241 AUDI Turbo/Super Charger Boost Sensor 'B' Circuit Low | AutoCodes

IknowHuhA6

+1
Occam's razor. Brilliant.

Curious myself what plugs were used. In my experience, supercharged engines don't do well with platinum or iridium plugs. Supercharged engines have much hotter combustion temperatures because of the friction resulting from super compacted air. Platinum/Iridium coatings retain heat longer and don't dissipate it well, causing premature detonation; Resulting in misfires and loss of power.
Copper plugs have always been my preference for forced induction engines.

Nobody Panic!!! that's just my opinion.