My car has P0171 which is system too lean. An I don't know how to solve that problem. I use the scanning app check the data, but I don't understand what it means. Anyone could help me where is the problem? This is the data of the car. Thanks.


Movi

2013-05-27 10:58:28
Make: Audi
Port: usbserial-A400gWkM Chip: ELM327 v1.4 OBD: AUTO, ISO 15765-4 (CAN 11/500) VIN: WAUGN74F17N134727

Diagnostic Trouble Codes
Code Description Retrieval Time
P0171 System too Lean (Bank 1) 2013-05-27 10:58:20
P0171 System too Lean (Bank 1) (Pending) 2013-05-27 10:58:20

Freeze Frame Data
PID Description Value Units Retrieval Time
00 PIDs supported 1-20 7F 9F C0 03 2013-05-27 10:58:01
02 Freeze frame trouble code P0171 2013-05-27 10:58:01
03 Fuel system status Fuel system #2 - Closed loop, using oxygen sensor feedback to determine fuel mix. Fuel system #1 - Closed loop, using oxygen sensor feedback to determine fuel mix. 2013-05-27 10:58:01
04 Calculated engine load value 58.82 % Percent 2013-05-27 10:58:02
05 Engine coolant temperature 96.0 Celsius 2013-05-27 10:58:02
06 Short term fuel % trim Bank 1 26199.89 % Percent 2013-05-27 10:58:02
07 Long term fuel % trim Bank 1 29402.02 % Percent 2013-05-27 10:58:02
08 Short term fuel % trim Bank 2 26601.42 % Percent 2013-05-27 10:58:02
09 Long term fuel % trim Bank 2 28602.08 % Percent 2013-05-27 10:58:02
0C Engine RPM 2020 rpm 2013-05-27 10:58:03
0D Vehicle speed 57.79 mph 2013-05-27 10:58:03
0E Timing advance 9 relative to #1 cylinder 2013-05-27 10:58:03
0F Intake air temperature 29.0 Celsius 2013-05-27 10:58:03
10 MAF air flow rate 24.11 g/s 2013-05-27 10:58:03
11 Throttle position 22 Percent 2013-05-27 10:58:04
12 Commanded secondary air status From the outside atmosphere or off 2013-05-27 10:58:04
1F Run time since engine start 207 seconds 2013-05-27 10:58:04
20 PIDs supported 21-40 20 04 20 01 2013-05-27 10:58:04
23 Fuel Rail Pressure (diesel) (gauge) 5600.00 kPa 2013-05-27 10:58:04
2E Commanded evaporative purge 0.00 % Percent 2013-05-27 10:58:05
33 Barometric pressure (Absolute) 96 (Absolute) kPa 2013-05-27 10:58:05
40 PIDs supported 41-60 7E D0 05 00 2013-05-27 10:58:05
42 Control module voltage 13.57 V 2013-05-27 10:58:05
43 Absolute load value 48.24 % Percent 2013-05-27 10:58:05
44 Command equivalence ratio 1.00 N/A 2013-05-27 10:58:06
45 Relative throttle position 11.76 % Percent 2013-05-27 10:58:06
46 Ambient air temperature 29.0 Celsius 2013-05-27 10:58:06
47 Absolute throttle position B 21.96 % Percent 2013-05-27 10:58:06
49 Accelerator pedal position D 33.73 % Percent 2013-05-27 10:58:06
4A Accelerator pedal position E 34.51 % Percent 2013-05-27 10:58:07
4C Commanded throttle actuator 16.08 % Percent 2013-05-27 10:58:07
56 Unknown PID 7F 7F 2013-05-27 10:58:07
58 Unknown PID 7E 7F 2013-05-27 10:58:07

Live Data
PID Description Value Units Retrieval Time
00 PIDs supported 1-20 BF 9F CA 1B 2013-05-27 10:57:55
01 Number of trouble codes MIL ON, 1 trouble code(s) flagged. 2013-05-27 10:57:55
03 Fuel system status Fuel system #2 - Closed loop, using oxygen sensor feedback to determine fuel mix. Fuel system #1 - Closed loop, using oxygen sensor feedback to determine fuel mix. 2013-05-27 10:57:55
04 Calculated engine load value 23.53 % Percent 2013-05-27 10:57:56
05 Engine coolant temperature 76.0 Celsius 2013-05-27 10:57:56
06 Short term fuel % trim Bank 1 25799.13 % Percent 2013-05-27 10:57:56
07 Long term fuel % trim Bank 1 29803.56 % Percent 2013-05-27 10:57:56
08 Short term fuel % trim Bank 2 25397.59 % Percent 2013-05-27 10:57:56
09 Long term fuel % trim Bank 2 28603.64 % Percent 2013-05-27 10:57:56
0C Engine RPM 651 rpm 2013-05-27 10:57:56
0D Vehicle speed 0.00 mph 2013-05-27 10:57:56
0E Timing advance 1 relative to #1 cylinder 2013-05-27 10:57:57
0F Intake air temperature 41.0 Celsius 2013-05-27 10:57:57
10 MAF air flow rate 3.19 g/s 2013-05-27 10:57:57
11 Throttle position 12 Percent 2013-05-27 10:57:57
12 Commanded secondary air status From the outside atmosphere or off 2013-05-27 10:57:57
15 Bank 1 Sensor 2- O2 sensor voltage, Short term fuel trim 0.770 Volts, % 2013-05-27 10:57:57
17 Bank 1 Sensor 4- O2 sensor voltage, Short term fuel trim 0.780 Volts, % 2013-05-27 10:57:57
1C OBD standards this vehicle conforms to OBD and OBD-II 2013-05-27 10:57:57
1D Oxygen sensors present 1-1, 1-2, 2-1, 2-2 Bank-Sensor 2013-05-27 10:57:58
1F Run time since engine start 640 seconds 2013-05-27 10:57:51
20 PIDs supported 21-40 A0 05 B4 19 2013-05-27 10:57:52
21 Distance traveled with malfunction indicator lamp (MIL) on 13 miles 2013-05-27 10:57:52
23 Fuel Rail Pressure (diesel) (gauge) 2940.00 kPa 2013-05-27 10:57:52
2E Commanded evaporative purge 23.14 % Percent 2013-05-27 10:57:52
30 # of warm-ups since codes cleared 0 count 2013-05-27 10:57:52
31 Distance traveled since codes cleared 88 miles 2013-05-27 10:57:52
33 Barometric pressure (Absolute) 97 (Absolute) kPa 2013-05-27 10:57:52
34 O2S1_WR_lambda(1)- Equivalence Ratio, Current 1.00, -0.01 N/A, mA 2013-05-27 10:57:52
36 O2S3_WR_lambda(1)- Equivalence Ratio, Current 1.00, -0.01 N/A, mA 2013-05-27 10:57:53
3C Catalyst Temperature Bank 1, Sensor 1 348.2 Celsius 2013-05-27 10:57:53
3D Catalyst Temperature Bank 1, Sensor 2 367.0 Celsius 2013-05-27 10:57:53
40 PIDs supported 41-60 FE D0 05 00 2013-05-27 10:57:53
41 Monitor status this drive cycle 00 06 65 29, See Onboard Tests 2013-05-27 10:57:53
42 Control module voltage 13.55 V 2013-05-27 10:57:53
43 Absolute load value 19.61 % Percent 2013-05-27 10:57:53
44 Command equivalence ratio 1.00 N/A 2013-05-27 10:57:54
45 Relative throttle position 2.35 % Percent 2013-05-27 10:57:54
46 Ambient air temperature 41.0 Celsius 2013-05-27 10:57:54
47 Absolute throttle position B 12.16 % Percent 2013-05-27 10:57:54
49 Accelerator pedal position D 14.90 % Percent 2013-05-27 10:57:54
4A Accelerator pedal position E 14.90 % Percent 2013-05-27 10:57:54
4C Commanded throttle actuator 3.14 % Percent 2013-05-27 10:57:54
56 Unknown PID 7F 7F 2013-05-27 10:57:54
58 Unknown PID 7E 7F 2013-05-27 10:57:55
MPG Instantaneous Fuel Economy 0 MPG 2013-05-27 10:57:55
BAT Battery Voltage 13.5 Volts 2013-05-27 10:57:55

On-board Tests
Name Available Status
Misfire No
Fuel System Yes Complete
Components Yes Complete
Catalyst Yes Complete
Heated Catalyst No
Evaporative System Yes Complete
Secondary Air System Yes Complete
A/C Refrigerant No
Oxygen Sensor Yes Complete
Oxygen Sensor Heater Yes Complete
EGR System No

 

Running lean almost always means that there is air entering your engine that has not been metered by the MAF. You most likely have a vacuum leak, which are common on these cars. They are easy to find when they are big enough, but I had an intermittent one last year that took forever to find. The less likely problem is the car thinks it is delivering enough fuel, but not enough is reaching the cylinders on one side (bank 1) of the engine. This could be due to a clogged fuel filter, and dirty or bad injector(s).

Go down through this list, and stop when the code stops happening:
1) Clean MAF
2) Find/fix vacuum leak
3) New fuel filter
4) Clean bank 1 injectors
5) Replace injector(s)

This should cover it 99% of the time

 

Run a can of Chem-Tune to clean the fuel system, its bloody brilliant. I can send you some if you cant find it. Just email me.
zoomtuning@gmail.com