So...I have run into an issue with my 2010 Audi A4. She's at ~105k miles and last fall developed some idling issues (throwing error code P2178). Basically, it will turn over, sputter for five to ten seconds, and die. It just started to do this, but a week ago it did idle roughly at a light for a few seconds, before returning to normal and running fine for a week, before deciding it doesn't want to move. I replaced sparks and ignition coils and neither helped.

Some history. Had issues in November of last year, as well. At the time, I replaced the PCV Valve Engine Crankcase Vent. That didn't solve the issue, so I replaced the Fuel Oil Pressure Sensor, and that did solve the issue.

Any thoughts on how to pinpoint the issue?? Many thanks in advance!

 

What codes are you seeing now.

 

It's P2178.

 

This would indicate a faulty O2 sensor . I would look at replacing it as it would be the lowest cost option. Also check the connection at the MAF sensor and maybe clean it if the O2 sensor doesn't solve the problem.

 

Thanks. I replaced the high pressure fuel pump today and it helped, but didn't fix the problem. The car doesn't outright die now. Idles with a few sputters here and there.

Think best nest step is O2 sensor (front? rear?)? Someone else is also mentioning injectors?

 

Okay, bought VCDS and here are the Engine codes. Does this help?

12 Faults Found:


4698 - Function Restriction due to Faults in Other Modules
U1113 00 [032] - -
Intermittent - Not Confirmed - Tested Since Memory Clear
4699 - Function Restriction due to Faults in Other Modules
U1113 00 [032] - -
Intermittent - Not Confirmed - Tested Since Memory Clear
5582 - Oil Pressure Switch for reduced Oil Pressure
P164D 00 [032] - Malfunction
Intermittent - Not Confirmed - Tested Since Memory Clear
4629 - ECM Power Relay Load Circuit
P068A 00 [032] - Opens Too Early
Intermittent - Not Confirmed - Tested Since Memory Clear
2697 - Fuel Pressure Sensor (G247)
P0190 00 [032] - Circuit Malfunction
Intermittent - Not Confirmed - Tested Since Memory Clear
4113 - Camshaft Position Sensor (G40)
P0341 00 [096] - Implausible Signal
Intermittent - Not Confirmed - Tested Since Memory Clear
2822 - Bank 1; System Too Rich off Idle
P2178 00 [101] - -
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 181415 km
Date: 2019.04.12
Time: 18:26:29


Engine speed: 1357.00 /min
Normed load value: 20.4 %
Vehicle speed: 45 km/h
Coolant temperature: 90 °C
Intake air temperature: 30 °C
Ambient air pressure: 990 mbar
Voltage terminal 30: 14.418 V
Unlearning counter according OBD: 63


4060 - Cylinder 3
P0303 00 [096] - Misfire Detected
Intermittent - Not Confirmed - Tested Since Memory Clear
4063 - Cylinder 4
P0304 00 [096] - Misfire Detected
Intermittent - Not Confirmed - Tested Since Memory Clear
4051 - Random/Multiple Cylinder Misfire Detected
P0300 00 [096] - -
Intermittent - Not Confirmed - Tested Since Memory Clear
4106 - Bank 1; System too Rich at Idle
P2188 00 [096] - -
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 5
Mileage: 181354 km
Date: 2019.04.10
Time: 17:40:12


Engine speed: 788.50 /min
Normed load value: 10.6 %
Vehicle speed: 37 km/h
Coolant temperature: 72 °C
Intake air temperature: 12 °C
Ambient air pressure: 990 mbar
Voltage terminal 30: 14.347 V
Unlearning counter according OBD: 36


4187 - Intake Air Temp. Sensor (G42)
P0113 00 [032] - Signal too High
Intermittent - Not Confirmed - Tested Since Memory Clear