P0174 and P0171
11-19-2016, 07:21 PM
#1
Thread Starter
Join Date: Nov 2016
Location: Oklahoma
Posts: 2
P0174 and P0171
Got this car about a year ago and it ran great and about 3 months ago i cut the exhaust out and dumped it right under the seats, drilled a hole in the pipe and put the 02 sensor in it. now this passed week i hear a popping when its idling almost like a very small back fire. so last night a replaced the spark plugs and now today it started throwing lean on bank 1 and 2. it did throw one very small vacuum leak code but i replaced a hose that was dry rotted and it never threw that code again but now i have this. just wanted to get everyone elses opinion. hopefully its something simple
02-08-2017, 11:01 AM
#5
Join Date: Feb 2017
Location: Puerto Rico
Posts: 1
Hi! I desperately need some expert help. I bought a 2012 GT about 2 weeks ago and about 2 days after I left the dealer I got codes P0171 & P0174. Those are the only codes I get. The car runs great, idles fine (except for ~20 RPM fluctuations every 5-10 seconds or so) and the car is not smoking in any way. As for mods, to my knowledge it has the Boss 302 Intake Manifold, Flowmaster Outlaw Exhaust, and a JLT Cold Air Intake. I'm sure it has a tune (because the intake manifold is a tune required part) but, I don't know what tune it has. I don't know if the exhaust pipes were changed or if the injectors were changed as well.
Performance-wise, the car runs perfect. All that bothers me is the check engine light, the eye-burning exhaust fumes, and increased fuel consumption. The car has 40,000 miles on it and except for this, is in pristine condition.
So far, I have cleaned the MAF sensor and sealed a loose plug that is on the JLT Cold Air Intake; just behind the MAF Sensor. I also purchased the fuel filter to replace it this week.
Under no load (at idle, 1,500 and 2,000 RPM) the STFT fluctuates between 12-22% and LTFT stays constantly at 29.7% (it does not move at all). Under load (in 4th gear at constant 3,000 RPM) the STFT drops to 0% or -6.7% but, the LTFT does not move from 29.7% (even after 15 mins of driving).
I've included the Freeze Frame data from my ODBII scan tool to see if someone can make sense of it. What I find extremely weird is that O2 Bank 1&2 - Sensor 2 - Short Term Fuel Trim is constant at 99.2 %. Any help would be sincerely appreciated.
Feb 06, 2017 5:36 PM
VIN retrieved from Vehicle
VIN: 1ZVBP8CF7C5242002
Make:Ford Year:2012
Trouble Code P0171 triggered Freeze Frame.
Code Def: System Too Lean Bank 1
PID : Description : Value
01 : Monitor Status Since DTCs Cleared : 0
04 : Calculated Engine Load Value : 25.5 %
05 : Engine Coolant Temperature : 198 °F
06 : Short Term Fuel Trim Bank 1 : 22.7 %
07 : Long Term Fuel Trim Bank 1 : 29.7 %
08 : Short Term Fuel Trim Bank 2 : 18.8 %
09 : Long Term Fuel Trim Bank 2 : 29.7 %
0C : Engine RPM : 686 rpm
0D : Vehicle Speed : 0 MPH
0E : Timing Advance for #1 cylinder : 15.5 °
0F : Intake Air Temperature : 117 °F
10 : Mass Air Flow Rate : 0.41 lb/min
11 : Absolute Throttle Position : 13.7 %
15 : O2 Bank 1 - Sensor 2 - Oxygen Sensor Voltage : 0.525 V
15 : O2 Bank 1 - Sensor 2 - Short Term Fuel Trim : 99.2 %
19 : O2 Bank 2 - Sensor 2 Oxygen Sensor Voltage : 0.820 V
19 : O2 Bank 2 - Sensor 2 Short Term Fuel Trim : 99.2 %
1F : Run Time Since Engine Start : 145 seconds
2E : Commanded Evaporative Purge : 0.0 %
2F : Fuel Level Input : 94.1 %
30 : # of Warm-ups Since Codes Cleared : 1
31 : Distance Traveled Since Codes Cleared : 9 mile
32 : Evap. System Vapor Pressure : 0.2 inH₂O
33 : Barometric Pressure : 23 inHg
34 : Wide Range O2S: Bank 1 - Sensor 1 - Current : 0.078 mA
34 : Wide Range O2S: Bank 1 - Sensor 1 - Equivalence Ratio : 1.057 λ
www.BlueDriver.net Freeze Frame Report
Disclaimer:
© Copyright 2016 Page 1
This information is provided without warranty and is subject to the Terms of Use posted at
www.lemurmonitors.com/eula.html. Reproduction of this information or any portion thereof constitutes
infringement of copyright.
38 : Wide Range O2S: Bank 2 - Sensor 1 - Current : 0.086 mA
38 : Wide Range O2S: Bank 2 - Sensor 1 - Equivalence Ratio : 1.055 λ
3C : Catalyst Temperature Bank 1 - Sensor 1 : 784.4 °F
3D : Catalyst Temperature Bank 2 - Sensor 1 : 784.4 °F
41 : Monitor Status this Drive Cycle : 0
42 : Control Module Voltage : 13.611 V
43 : Absolute Load Value : 9.8 %
44 : Commanded Equivalence Ratio : 0.985 λ
45 : Relative Throttle Position : 1.6 %
46 : Ambient Air Temperature : 68 °F
47 : Absolute Throttle Position B : 15.7 %
49 : Accelerator Pedal Position D : 15.7 %
4A : Accelerator Pedal Position E : 7.8 %
4C : Commanded Throttle Actuator : 2.7 %
Vehicle Protocol: CAN11_500
Sensor F/W Version: OSAPI v2.39
App Version: 6.8.72
Performance-wise, the car runs perfect. All that bothers me is the check engine light, the eye-burning exhaust fumes, and increased fuel consumption. The car has 40,000 miles on it and except for this, is in pristine condition.
So far, I have cleaned the MAF sensor and sealed a loose plug that is on the JLT Cold Air Intake; just behind the MAF Sensor. I also purchased the fuel filter to replace it this week.
Under no load (at idle, 1,500 and 2,000 RPM) the STFT fluctuates between 12-22% and LTFT stays constantly at 29.7% (it does not move at all). Under load (in 4th gear at constant 3,000 RPM) the STFT drops to 0% or -6.7% but, the LTFT does not move from 29.7% (even after 15 mins of driving).
I've included the Freeze Frame data from my ODBII scan tool to see if someone can make sense of it. What I find extremely weird is that O2 Bank 1&2 - Sensor 2 - Short Term Fuel Trim is constant at 99.2 %. Any help would be sincerely appreciated.
Feb 06, 2017 5:36 PM
VIN retrieved from Vehicle
VIN: 1ZVBP8CF7C5242002
Make:Ford Year:2012
Trouble Code P0171 triggered Freeze Frame.
Code Def: System Too Lean Bank 1
PID : Description : Value
01 : Monitor Status Since DTCs Cleared : 0
04 : Calculated Engine Load Value : 25.5 %
05 : Engine Coolant Temperature : 198 °F
06 : Short Term Fuel Trim Bank 1 : 22.7 %
07 : Long Term Fuel Trim Bank 1 : 29.7 %
08 : Short Term Fuel Trim Bank 2 : 18.8 %
09 : Long Term Fuel Trim Bank 2 : 29.7 %
0C : Engine RPM : 686 rpm
0D : Vehicle Speed : 0 MPH
0E : Timing Advance for #1 cylinder : 15.5 °
0F : Intake Air Temperature : 117 °F
10 : Mass Air Flow Rate : 0.41 lb/min
11 : Absolute Throttle Position : 13.7 %
15 : O2 Bank 1 - Sensor 2 - Oxygen Sensor Voltage : 0.525 V
15 : O2 Bank 1 - Sensor 2 - Short Term Fuel Trim : 99.2 %
19 : O2 Bank 2 - Sensor 2 Oxygen Sensor Voltage : 0.820 V
19 : O2 Bank 2 - Sensor 2 Short Term Fuel Trim : 99.2 %
1F : Run Time Since Engine Start : 145 seconds
2E : Commanded Evaporative Purge : 0.0 %
2F : Fuel Level Input : 94.1 %
30 : # of Warm-ups Since Codes Cleared : 1
31 : Distance Traveled Since Codes Cleared : 9 mile
32 : Evap. System Vapor Pressure : 0.2 inH₂O
33 : Barometric Pressure : 23 inHg
34 : Wide Range O2S: Bank 1 - Sensor 1 - Current : 0.078 mA
34 : Wide Range O2S: Bank 1 - Sensor 1 - Equivalence Ratio : 1.057 λ
www.BlueDriver.net Freeze Frame Report
Disclaimer:
© Copyright 2016 Page 1
This information is provided without warranty and is subject to the Terms of Use posted at
www.lemurmonitors.com/eula.html. Reproduction of this information or any portion thereof constitutes
infringement of copyright.
38 : Wide Range O2S: Bank 2 - Sensor 1 - Current : 0.086 mA
38 : Wide Range O2S: Bank 2 - Sensor 1 - Equivalence Ratio : 1.055 λ
3C : Catalyst Temperature Bank 1 - Sensor 1 : 784.4 °F
3D : Catalyst Temperature Bank 2 - Sensor 1 : 784.4 °F
41 : Monitor Status this Drive Cycle : 0
42 : Control Module Voltage : 13.611 V
43 : Absolute Load Value : 9.8 %
44 : Commanded Equivalence Ratio : 0.985 λ
45 : Relative Throttle Position : 1.6 %
46 : Ambient Air Temperature : 68 °F
47 : Absolute Throttle Position B : 15.7 %
49 : Accelerator Pedal Position D : 15.7 %
4A : Accelerator Pedal Position E : 7.8 %
4C : Commanded Throttle Actuator : 2.7 %
Vehicle Protocol: CAN11_500
Sensor F/W Version: OSAPI v2.39
App Version: 6.8.72