P2177 - System Too Lean Off Idle - Bank 1

[focustitanium12]

Hi Again,

A reoccurance of my loss of power issue happened again.

This time I have managed to capture the DTC codes that come up, see below.

Any ideas? As per previous posting that I made about this issue (sans dtc codes) I have checked the intake and vacuum hoses and there are no issues, pretty sure there is not an exhaust leak at all. Only other thing I can see is it could be the MAF.

Thanks in advance.

===PCM DTC P2177:00-64===
Code: P2177 - System Too Lean Off Idle - Bank 1

Status: 
 - DTC Maturing - Intermittent at Time of Request
 - Malfunction Indicator Lamp is Off for this DTC
 - Test not complete

Module: Powertrain Control Module

 Freeze Frame :
-LOAD: 35.29 % - Calculated Load Value
-ECT: 95 °C - Engine coolant temperature
-RPM: 2581 rev/min - Engine Revolutions Per Minute
-FUELSYS: Closed Loop  - Fuel System Status (Open/Closed Loop)
-SHRTFT1: 25.00 % - Short term fuel trim 1
-LONGFT1: 24.22 % - Long term fuel trim 1
-MAP: 79.0 kPa - Manifold absolute pressure sensor
-VSS: 108.0 km/h - Vehicle Speed
-SPARKADV: 24.50 ° - Spark Advance
-IAT: 4 °C - Intake Air Temperature
-MAF: 16.30 g/sec - Mass Air Flow
-TP: 28.24 % - Throttle Position
-RUNTM: 1041 sec - Time Since Engine Start
-FRP: 11280.0 kPa - Fuel Rail Pressure
-EVAP_PCT: 0.00 % - Commanded Evaporative Purge
-FLI: 45.10 % - Fuel Level
-BARO: 101.0 kPa - Barometric pressure
-VPWR: 14.89 Volt - Control Module Voltage
-LOAD_ABS: 62.75 % - Absolute Load Value
-EQRAT11_CMD: 14.640 :1 - Commanded Equivalence Ratio (Air to Fuel Mixture) Bank 1
-TP_REL: 15.69 % - Relative Throttle Position
-AAT: 3 °C - Ambient Air Temperature
-TP_B: 27.84 % - Throttle Position Sensor 2
-APP_D: 32.94 % - Accelerator Pedal Position D
-APP_E: 33.33 % - Accelerator Pedal Position E
-TAC_PCT: 23.92 % - Commanded Throttle Actuator Control
-FF_INF: 0.00 % - Inferred Flex Fuel Percentage
-LONGFT12: 0.00 % - Long Term Fuel Trim (Bank 1, Sensor 2)
-APP_REL: 18.43 % - Accelerator Pedal Position Relative
===END PCM DTC P2177:00-64===

===PCM DTC P2187:00-64===
Code: P2187 - System Too Lean at Idle - Bank 1

Status: 
 - DTC Maturing - Intermittent at Time of Request
 - Malfunction Indicator Lamp is Off for this DTC
 - Test not complete

Module: Powertrain Control Module

 Freeze Frame :
-LOAD: 17.25 % - Calculated Load Value
-ECT: 93 °C - Engine coolant temperature
-RPM: 915 rev/min - Engine Revolutions Per Minute
-FUELSYS: Closed Loop  - Fuel System Status (Open/Closed Loop)
-SHRTFT1: 25.00 % - Short term fuel trim 1
-LONGFT1: 59.38 % - Long term fuel trim 1
-MAP: 40.0 kPa - Manifold absolute pressure sensor
-VSS: 0.0 km/h - Vehicle Speed
-SPARKADV: -4.00 ° - Spark Advance
-IAT: 6 °C - Intake Air Temperature
-MAF: 2.33 g/sec - Mass Air Flow
-TP: 16.08 % - Throttle Position
-RUNTM: 1431 sec - Time Since Engine Start
-FRP: 2910.0 kPa - Fuel Rail Pressure
-EVAP_PCT: 0.00 % - Commanded Evaporative Purge
-FLI: 36.47 % - Fuel Level
-BARO: 101.0 kPa - Barometric pressure
-VPWR: 12.16 Volt - Control Module Voltage
-LOAD_ABS: 27.06 % - Absolute Load Value
-EQRAT11_CMD: 14.640 :1 - Commanded Equivalence Ratio (Air to Fuel Mixture) Bank 1
-TP_REL: 3.53 % - Relative Throttle Position
-AAT: 5 °C - Ambient Air Temperature
-TP_B: 15.69 % - Throttle Position Sensor 2
-APP_D: 14.90 % - Accelerator Pedal Position D
-APP_E: 15.29 % - Accelerator Pedal Position E
-TAC_PCT: 5.49 % - Commanded Throttle Actuator Control
-FF_INF: 0.00 % - Inferred Flex Fuel Percentage
-LONGFT12: 3.13 % - Long Term Fuel Trim (Bank 1, Sensor 2)
-APP_REL: 0.00 % - Accelerator Pedal Position Relative
===END PCM DTC P2187:00-64===

===OBDII DTC P2177-P===
Code: P2177 - System Too Lean Off Idle - Bank 1

Status: 
 - Pending - malfunction is expected to be confirmed 

Module: On Board Diagnostic II

===END OBDII DTC P2177-P===

[iantt]

upstream broadband hego sensor is probably whats causing this. you can see the longterm fuel trims are way higher than it should be. 

i wouldnt say its common but i have done a few. 

[focustitanium12]

Well that just went way over my head 

It did take about 2 weeks or so for this to come back and i have reset the adaptations again and the fuel consumption has gone back to normal after resetting the codes. 

I think I put the long term fuel trim on the graph that I saved will have to check when I charge the laptop back up. 

[mjt]

Hego Sensor = Heated Exhaust Gas Oxygen Sensor also known as a Lambda Sensor. Upstream means it's the one before the cat.

[focustitanium12]

43 minutes ago, mjt said:

Hego Sensor = Heated Exhaust Gas Oxygen Sensor also known as a Lambda Sensor. Upstream means it's the one before the cat.

OK, thanks for that, is it any easy job to change? Or best for a garage to do? 

[focustitanium12]

Would this be the sensor that would need to be fitted?

https://www.autopartspro.co.uk/bosch-7887383

[iantt]

i did only say probably. needs further investigation. can you pull up live data on commanded equivalence ratio, and hego sensor bank1 sensor 1

 

[iantt]

opie oils do them for £60 inc postage . thats cheap compared with ford ones. 

[iantt]

10 hours ago, focustitanium12 said:

OK, thanks for that, is it any easy job to change? Or best for a garage to do? 

all you need normally is a 22mm spanner. but sometimes they can get stuck in, then a proper hego sensor socket may be required. 

its right at the front and connector is at the side. 

[focustitanium12]

43 minutes ago, iantt said:

i did only say probably. needs further investigation. can you pull up live data on commanded equivalence ratio, and hego sensor bank1 sensor 1

 

I can do that a bit later, do I need to go for a drive or will just idling do?

[iantt]

stationary is ok. basically have it on idle and note the values, then rev the engine briefly checking if the values change. 

[focustitanium12]

Is it the EQRAT11_CMD & EQ_RAT11 pid if so then 

EQRAT11_CMD - Idling was 14.640 and Reving was 29.280

EQ_RAT11 - Idling was hovering at 14.4 and Reving was 29.280 (This was the only other Bank 1 Sensor 1 i had)

Also did O2S11_IMPED at idle 1.00Volt and reving stayed at 1.00 with the odd 1.01Volt.

I have also saved the stream log file if that is any help.

[iantt]

not sure on your pid descriptions, what software are you using?

[focustitanium12]

32 minutes ago, iantt said:

not sure on your pid descriptions, what software are you using?

Using forscan.

I can link the stream save file if needed.

[iantt]

yeah, i will have a look

[focustitanium12]

Hopefully this will work for you. 

https://www.dropbox.com/s/17sgbs3wvkdz9f0/hego2.fsl?dl=0

[JONATHAN_11_80]

Short term fuel trim is high at 25% should hover in single figures this shows the engine management is increasing the fueling to compensate for the lean condition.  I would check all inlet pipes for cracks and splits including all PCV hoses.  I would also spray some WD40 on the inlet manifold where it joins with the head and listen for change in engine note as this shows it sucking in the wd40 through the joint.

[focustitanium12]

5 hours ago, JONATHAN_11_80 said:

Short term fuel trim is high at 25% should hover in single figures this shows the engine management is increasing the fueling to compensate for the lean condition.  I would check all inlet pipes for cracks and splits including all PCV hoses.  I would also spray some WD40 on the inlet manifold where it joins with the head and listen for change in engine note as this shows it sucking in the wd40 through the joint.

I did have a good check of all the pipes a couple of weeks ago when this issue first happened, which i incorrectly cleared the codes before checking with the engine running. All the pipes are in good order with no visible issues. After I did the PCM Reset All Adaptations I luckily had the Short term Fuel trim still selected and was hovering in the single figure range, with the odd blip to a max of 11%.

The only thing I did not check was how the K&N was seated since instalation but I thought that as the car runs normally for 2 weeks then the issue happens then I is likely a sensor issue of some sort, not sure if something has gone a bit haywire when I changed the battery 4 weeks ago now and takes 2 weeks to manifest itself. Really clutching at straws now!

Also coincidental that it happened the both times when I got to half a tank! Probably too coincidental that one haha

[iantt]

23 hours ago, focustitanium12 said:

Hopefully this will work for you. 

https://www.dropbox.com/s/17sgbs3wvkdz9f0/hego2.fsl?dl=0

Can't see /open it on my tablet or phone. Got forscan on laptop so will fire that up later or tommorow. 

[focustitanium12]

14 minutes ago, iantt said:

Can't see /open it on my tablet or phone. Got forscan on laptop so will fire that up later or tommorow. 

I have popped it on my google drive as well if it doesn't work....

https://drive.google.com/file/d/1mJhzt_o2-7azWgtX49LHdi8KV1cx_ClN/view?usp=sharing

[focustitanium12]

Hopefully this is a final update to say that I took a punt and got a new hego (O2) sensor for the car and since I swapped it out I have done around 4-500 miles with no further occurrences. The old sensor looked in a bit of a state so glad I did it and the car is back to normal. Thanks for the assist 

[Mohamad Louai]

Hello guys i got 2009 ford focus st i have had for 2 month, since I bought it the engine light came on and it’s showing as system too lean of idle at bank 1 p2177 changed MAF sensor and o2 sensor before  converter 

[Mohamad Louai]

On 9/15/2023 at 1:05 AM, Mohamad Louai said:

sensor

 

On 9/15/2023 at 1:05 AM, Mohamad Louai said:

Hello guys i got 2009 ford focus st i have had for 2 month, since I bought it the engine light came on and it’s showing as system too lean of idle at bank 1 p2177 changed MAF sensor and o2 sensor before  converter 

And it’s still showing as system too lean 

[RL123]

Is that the only dtc that’s been recorded through the obd socket? . If read from Forscan on Ford software, are there any ‘u’ codes?  My son’s 2008 st had the cluster issue but that generated limp home issues.