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.
2021 Ford Explorer STFACTORY OEM SERVICE PROCEDURE
Electronic Engine Controls - 3.0L ECOBOOST
- Description And Operation
- Diagnosis And Testing
- Electronic Engine Controls
- Diagnostic Trouble Code (DTC) Chart
- Pinpoint Tests
- Notes
- Pinpoint Test A : U0121
- Pinpoint Test B : U0126, U0212
- Pinpoint Test C : U0151
- Pinpoint Test D : U0230
- Pinpoint Test E : U023A
- Pinpoint Test F : U0252
- Pinpoint Test G : U0253:
- Pinpoint Test H : U0404, U0405, U0416, U0428, U1014, U0102F
- Pinpoint Test I : P025A, P025B, P025C, P025D, P027B
- Pinpoint Test J : P0521, P0524, P06DD, P06DE
- Pinpoint Test K : P06DA, P06DB, P06DC
- Pinpoint Test L : P06E9
- Pinpoint Test M : P1001
- Pinpoint Test N : P166A
- Electronic Engine Controls
- Removal And Installation
- Camshaft Position (CMP) Sensor
- Catalyst Monitor Sensor
- Crankshaft Position (CKP) Sensor
- Cylinder Head Temperature 2 (CHT2) Sensor
- Engine Coolant Temperature (ECT) Sensor
- Engine Oil Pressure (EOP) Sensor
- Fuel Rail Pressure and Temperature Sensor
- Heated Oxygen Sensor (HO2S)
- Intake Air Temperature (IAT) Sensor
- Knock Sensor (KS)
- Manifold Absolute Pressure and Temperature (MAPT) Sensor
- Oil Pressure Control Solenoid
- Powertrain Control Module (PCM)
- Turbocharger Boost Pressure (TCBP) and Charger Air Cooler Temperature (CACT) Sensor
- Turbocharger Bypass Valve
- Variable Camshaft Timing (VCT) Oil Control Solenoid
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.
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