Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2017 Ford Fiesta STFACTORY OEM SERVICE PROCEDURE
Anti-Lock Brake System And Stability Control DTCS: Pcm
DTC INDEX
| DTC | Description | Action |
|---|---|---|
| P0557 | Brake Booster Pressure Sensor Circuit Low | GO to Pinpoint Test Q |
| P0558 | Brake Booster Pressure Sensor Circuit High | GO to Pinpoint Test Q |
| - | All other PCM Diagnostic Trouble Codes (DTCs) | REFER to: Electronic Engine Controls - 1.0L EcoBoost .REFER to: Electronic Engine Controls - 1.6L Duratec .REFER to: Electronic Engine Controls - 1.6L EcoBoost . |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.