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.
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HOMESERVICE MANUALSFORD2021EXPEDITION MAX LIMITED, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - DIAGNOSTIC METHODS (EXCEPT DIESEL & HYBRID)PARAMETER IDENTIFICATION (PID)GENERIC OBD PID LIST
2021 Ford Expedition MAX Limited, RWD
Generic OBD PID List
2021 Ford Expedition MAX Limited, RWDSECTION Generic OBD PID List
An X in the Freeze Frame column denotes both a mode 1 and mode 2 PID (real time and freeze frame).
| Freeze Frame | Acronym | Description | Measurement Units |
|---|---|---|---|
| X | APP_D | Accelerator Pedal Position D | % |
| X | APP_E | Accelerator Pedal Position E | % |
| X | BARO | Barometric Pressure | kPa |
| X | CATEMP11 | Catalyst Temperature Bank 1, Sensor 1 | Degrees |
| X | CATEMP12 | Catalyst Temperature Bank 1, Sensor 2 | Degrees |
| X | CATEMP21 | Catalyst Temperature Bank 2, Sensor 1 | Degrees |
| X | CATEMP22 | Catalyst Temperature Bank 2, Sensor 2 | Degrees |
| X | CLRDIST | Distance Since Codes Cleared | Km, mi |
| X | CLRWRMUP | Number Of Warm Ups Since DTCs Cleared | Units |
| X | ECT | Engine Coolant Temperature | Degrees |
| X | EGRPCT | Commanded EGR | % |
| X | EGR_ERR | EGR Error | % |
| X | EVAP_VP | Evaporative System Vapor Pressure | kPa |
| X | EQ_RAT | Commanded Equivalence Ratio | Unit |
| X | FLI | Fuel Level Input | % |
| X | FRP | Fuel Rail Pressure | kPa |
| X | FUEL SYS1 | Fuel System Feedback Control Status Bank 1 | Open Loop, Closed Loop |
| X | FUEL SYS2 | Fuel System Feedback Control Status Bank 2 | Open Loop, Closed Loop |
| X | IAT | Intake Air Temperature | Degrees |
| X | LOAD | Calculated Engine Load | % |
| X | LOAD_ABS | Absolute Load Value | % |
| X | LONGFT1 | Current Bank 1 Fuel Trim Adjustment (kamrefl) From Stoichiometry Which Is Considered Long Term | % |
| X | LONGFT2 | Current Bank 2 Fuel Trim Adjustment (kamref2) From Stoichiometry Which Is Considered Long Term | % |
| X | MAF | Mass Airflow Rate | g/s-lb/min |
| X | MAP | Manifold Absolute Pressure | Volts, kPa, PSI, in-Hg |
| X | MIL_DIST | Distance Traveled with MIL ON | Kilometer |
| X | O2S11 | Bank 1 Upstream Oxygen Sensor (11) | Volts |
| X | O2S12 | Bank 1 Downstream Oxygen Sensor (12) | Volts |
| X | O2S13 | Bank 1 Downstream Oxygen Sensor (13) | Volts |
| X | O2S21 | Bank 2 Upstream Oxygen Sensor (21) | Volts |
| X | O2S22 | Bank 2 Downstream Oxygen Sensor (22) | Volts |
| X | O2S23 | Bank 2 Downstream Oxygen Sensor (23) | Volts |
| OBDSUP | On Board Diagnostic System | OBD II OBD I OBD Combination of or None |
|
| X | PTO | Power Take Off Status | On, Off |
| X | RPM | Revolutions Per Minute | RPM |
| X | RUNTM | Run Time | Seconds |
| X | SHRTFT1 | Current Bank Fuel Trim Adjustment (lambse1) From Stoichiometry Which Is Considered Short Term | % |
| X | SHRTFT2 | Current Bank 2 Fuel Trim Adjustment (lambse1) From Stoichiometry Which Is Considered Short Term | % |
| X | SPARKADV | Spark Advance Requested | Degrees |
| X | TAC_PCT | Commanded Throttle Actuator | % |
| X | TP | Throttle Position | % |
| X | TP REL | Relative Throttle Position | % |
| VSS | Vehicle Speed Sensor | km/h, mph |
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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.