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.
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 | AAT | Ambient Air Temperature | Degrees | ||||||
| X | APP_D | Accelerator Pedal Position D | % | ||||||
| X | APP_E | Accelerator Pedal Position E | % | ||||||
| X | CATEMP11 | Catalyst Temperature Bank 1, Sensor 1 | Degrees | ||||||
| X | CATEMP12 | Catalyst Temperature Bank 1, Sensor 2 | Degrees | ||||||
| CLR_DST | Distance since codes cleared | Km | |||||||
| CCNT | Continuous DTC Counter | DECIMAL | |||||||
| X | ECT | Engine Coolant Temperature | DEGREES | ||||||
| X | EGR_PCT | Commanded EGR | % | ||||||
| X | EGR_ERR | EGR Error | % | ||||||
| X | EVAP_PCT | Commanded Evaporative Purge | % | ||||||
| X | EVAP_VP | Evaporative System Vapor Pressure | Pa | ||||||
| X | EQ_RAT | Commanded Equivalence Ratio | Unit | ||||||
| X | FUEL SYS1 | Fuel System Feedback Control Status-Bank 1 | OL/CL/OL DRIVE (1) /OL FAULT/CL FAULT | ||||||
| IAT | Intake Air Temperature | DEGREES | |||||||
| X | LOAD | (2) Calculated Engine Load | % | ||||||
| X | LOAD_ABS | Absolute Load Value | % | ||||||
| X | LONG FT1 | Current Bank 1 fuel trim adjustment from stoichiometry which is considered long term. | % | ||||||
| MAF | Mass Air Flow Rate | gm/s-lb/min | |||||||
| MIL_DIST | Distance traveled with MIL on | Kilometer | |||||||
| O2S11 | Bank 1 Upstream Oxygen Sensor (11) | VOLTS | |||||||
| O2S12 | Bank 1 Downstream Oxygen Sensor (12) | VOLTS | |||||||
| OBD SUP | On-Board Diagnostic System | OBD II OBD I OBD Combination of or None |
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| X | RPM | Revolutions per Minute | RPM | ||||||
| X | RUNTM | Run time | Seconds | ||||||
| X | SHRT FT1 | Current bank fuel trim adjustment from stoichiometry which is considered short term. | % | ||||||
| SHRT FT11 (3) | Current bank fuel trim adjustment from stoichiometry which is considered short term. | % | |||||||
| SHRT FT12 (3) | Current bank 1 fuel trim adjustment from stoichiometry which is considered short term. | % | |||||||
| SPARKADV | Spark Advance Cylinder No. 1 | DEGREES | |||||||
| X | SPARK_ACT | Spark Advance Actual | Degrees | ||||||
| X | TAC_PCT | Commanded Throttle Actuator | % | ||||||
| TP | Throttle Position | % | |||||||
| X | TP_R | Relative Throttle Position | % | ||||||
| WARM_UPS | Number of warm ups since codes cleared | Units | |||||||
| X | VSS | Vehicle Speed Sensor | km/h-mph | ||||||
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CL = Closed loop using HO2S(s) as feedback for fuel control.
OL DRIVE = Open loop due to driving conditions (heavy acceleration).
OL FAULT = Open loop due to fault with all upstream HO2S.
CL FAULT = Closed loop fuel control, but fault with one upstream HO2S.
NO RELATED
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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.