Hi,

 

any tips for Ford Focus 2015 1.0 125hp with Service Engine Now alarms every now and then after 80-100ml drive? This usually happens when driving 70mph or similiar speeds and when warning is shown, car goes into a limp mode. Engine restart clears error. Oil pump, vacuum pump and map sensor replaced after issues started. Local auth ford dealer failed to load full list of error codes, timeout or incomplete results or no persistent fault codes.

Any tips for troubleshooting to catch the actual problem?

When were the wet belts replaced ? Did this problem start before or after the belts were changed ?

The belts were replaced last year, before I got the car.

48 minutes ago, mmt75 said:

The belts were replaced last year, before I got the car.

What reliable evidence is there that it was done?

Have the codes been read whilst in limp mode i.e. with the fault actually present?

No other evidence than stamps on service manual 😐

I've yet to read the codes while service engine is lit, the BT obd reader that I have used, may not be the best, and I've ordered a OBDlink for forscan to capture the code. No recorded codes read with the cheap reader.

I hv 2018 focus, exactly same problem. Turn off engine and it clears from limp mode with check engine coming on. I’m getting turbo under boost fault as well.  Found slithers of metal filings in vacuum pump and oil. 41000 miles on clock. 
worth changing vacuum ?  Anyone used Metzger ? Pumaspeed?  Ford ones are over £500 !  Oil changed only couple months ago.

thanks.

11 hours ago, Mckbrian2 said:

I hv 2018 focus, exactly same problem. Turn off engine and it clears from limp mode with check engine coming on. I’m getting turbo under boost fault as well.  Found slithers of metal filings in vacuum pump and oil. 41000 miles on clock. 
worth changing vacuum ?  Anyone used Metzger ? Pumaspeed?  Ford ones are over £500 !  Oil changed only couple months ago.

thanks.

If there's metal in the oil, I wouldn't buy a brand new vac pump.  Try a used one first.  The problem could be far bigger than just a vac pump.

Can anyone recommend reliable used parts eg vacuum pump ? 

40 minutes ago, Mckbrian2 said:

Can anyone recommend reliable used parts eg vacuum pump ? 

Look at breakers yards on eBay.  Make sure you use one that offers warranty.  And check their eBay feedback to make sure most customers are happy with the service.

If you have a local breakers yard then see what the reviews are like for those, as parts might be a bit cheaper without the eBay business seller fees.

I have the 1.6 diesel hatch and the codes it gave me were injector number 4 was operating out of perameters. This is a common issue on the model to my understanding so i would reccomend getting or finding someone with a diag tool for fords and see what faults it gives you before going and replacing parts

Here's an output with Forcsan, after the "Service engine" is shown and limp mode is activated:

 

Quote

===PCM DTC P0299:00-6C===
Code: P0299 - Turbocharger/Supercharger 'A' Underboost Condition

Status (-6C):
 - DTC Maturing - Intermittent at Time of Request
 - Malfunction Indicator Lamp is Off for this DTC
 - Test not complete

Module: Powertrain Control Module

 Freeze Frame  #1:

 Freeze Frame  #2:
-EVENT_TIME: 331544385 s (Sun Jun 08 19:56:53 2025) - Event time
-TOTAL_DISTANCE: 197065 km - Total Distance
-FUELSYS: Closed Loop  - Fuel System Status (Open/Closed Loop)
-LOAD: 69.41 % - Calculated Load Value
-ECT: 83 °C - Engine coolant temperature
-SHRTFT1: -6.25 % - Short term fuel trim 1
-LONGFT1: 10.94 % - Long term fuel trim 1
-MAP: 141.0 kPa - Manifold absolute pressure sensor
-RPM: 2513 1/min - Engine Revolutions Per Minute
-VSS: 87.0 km/h - Vehicle Speed
-SPARKADV: 4.50 ° - Spark Advance
-IAT: 18 °C - Intake Air Temperature
-RUNTM: 1681 s - Time Since Engine Start
-FRP: 14460.0 kPa - Fuel Rail Pressure
-EVAP_PCT: 95.69 % - Commanded Evaporative Purge
-FLI: 37.65 % - Fuel Level
-BARO: 98.0 kPa - Barometric pressure
-VPWR: 12.15 V - Control Module Voltage
-TP_REL: 47.06 % - Relative Throttle Position
-TAC_PCT: 74.12 % - Commanded Throttle Actuator Control
-RPMDSD: 950 1/min - Desired Idle Speed RPM
-OSVB1S2: 0.23 V - Oxygen Sensor Voltage Bank 1 Sensor 2
===END PCM DTC P0299:00-6C===

===OBDII DTC None===
Successful DTC reading, no error codes found

Module: On Board Diagnostic II

===END OBDII DTC None===

===APIM DTC B108E:01-28===
Code: B108E - Display

Additional Fault Symptom (:01):
 - General Electrical Failure

Status (-28):
 - Previously Set DTC - Not Present at Time of Request
 - Malfunction Indicator Lamp is Off for this DTC

Module: Accessory Protocol Interface Module

===END APIM DTC B108E:01-28===

===SASM DTC None===
Successful DTC reading, no error codes found

Module: Steering Angle Sensor Module

===END SASM DTC None===

===ABS DTC None===
Successful DTC reading, no error codes found

Module: Antilock braking system

===END ABS DTC None===

===RCM DTC None===
Successful DTC reading, no error codes found

Module: Restraint Control Module

===END RCM DTC None===

===PAM DTC None===
Successful DTC reading, no error codes found

Module: Parking Aid Module

===END PAM DTC None===

===PSCM DTC None===
Successful DTC reading, no error codes found

Module: Power Steering Control Module

===END PSCM DTC None===

===BCMii DTC B109B:15-2C===
Code: B109B - License Plate Light

Additional Fault Symptom (:15):
 - Circuit Short To Battery Or Open

Status (-2C):
 - DTC Maturing - Intermittent at Time of Request
 - Malfunction Indicator Lamp is Off for this DTC

Module: Body Control Module

 Freeze Frame  #1:
-EVENT_TIME: 326779202 s (Mon Apr 14 16:17:09 2025) - Event time
-TOTAL_DISTANCE: 194773 km - Total Distance
-MODULE_VOLTAGE: 10.0 V - Control Module Voltage
-INCAR_TEMPERATURE: 23 °C - In car temperature
-PWR_MODE_QF: Power Mode OK  - Power Mode Quality Factor
-PWR_MODE_KEY: Start in Progress  - Power Mode Key State
===END BCMii DTC B109B:15-2C===

===FCIM DTC None===
Successful DTC reading, no error codes found

Module: Front Controls Interface Module

===END FCIM DTC None===

===PDM DTC None===
Successful DTC reading, no error codes found

Module: Passengers Door Control Unit

===END PDM DTC None===

===DDM DTC None===
Successful DTC reading, no error codes found

Module: Drivers Door Module

===END DDM DTC None===

===HVAC DTC None===
Successful DTC reading, no error codes found

Module: Heating Ventilation Air Conditioning

===END HVAC DTC None===

===RFA DTC None===
Successful DTC reading, no error codes found

Module: Remote Function Actuator

===END RFA DTC None===

===ACM DTC None===
Successful DTC reading, no error codes found

Module: Audio Control Module

===END ACM DTC None===

===IPC DTC None===
Successful DTC reading, no error codes found

Module: Instrument Panel Control Module

===END IPC DTC None===

===GPSM DTC U3003:16-88===
Code: U3003 - Battery Voltage

Additional Fault Symptom (:16):
 - Circuit Voltage Below Threshold

Status (-88):
 - Previously Set DTC - Not Present at Time of Request
 - Malfunction Indicator Lamp is On for this DTC

Module: Global Positioning System Module

===END GPSM DTC U3003:16-88===

It's no surprise the Code: P0299 is somehow related to Turbo, as MAP and airfilter is already exchanged, based on this, anyone have any tips on how to continue troubleshooting?

This is a long running thread on the same code so may have some ideas:
https://www.fordownersclub.com/forums/topic/161577-smax-22-diesel-off-road-for-year-after-injector-seal-help/

As said above suggest doing as much diagnosis, live date reading and checking for air leaks, turbo boost operating vacuum pipework, control and vanes etc, etc before firing the parts cannon.