2.3L PFI Service Code Definitions: Mustang
PFI SERVICE CODE DEFINITIONS
| Service Code | Test Condition(s) | Definition |
| 111 | KOEO/KOER/CONTINUOUS | System Pass |
| 112 | KOEO/CONTINUOUS | ACT Sensor Circuit Low Voltage |
| 113 | KOEO/CONTINUOUS | ACT Sensor Circuit High Voltage |
| 114 | KOEO/KOER | ACT Sensor High Or Low |
| 116 | KOEO/KOER | ECT Sensor High Or Low |
| 117 | KOEO/CONTINUOUS | ECT Sensor Circuit Low Voltage |
| 118 | KOEO/CONTINUOUS | ECT Sensor Circuit High Voltage |
| 121 | KOEO/KOER/CONTINUOUS | Closed Throttle Voltage High Or Low |
| 122 | KOEOc | TP Sensor Circuit Low Voltage |
| 123 | KOEOc | TP Sensor Circuit High Voltage |
| 124 | CONTINUOUS | TP Sensor Voltage High |
| 125 | CONTINUOUS | TP Sensor Voltage Low |
| 126 | KOEO/KOER/CONTINUOUS | BP Sensor High Or Low |
| 129 | KOER | Insufficient MAF Change During Dynamic Response Test |
| 144 | CONTINUOUS | No HO2S Switches Detected |
| 157 | CONTINUOUS | MAF Sensor Circuit Low Voltage |
| 158 | KOEO/CONTINUOUS | MAF Sensor Circuit High Voltage |
| 159 | KOEO/KOER | MAF Sensor High Or Low |
| 167 | KOER | Insufficient TP Change During Dynamic Response Test |
| 171 | CONTINUOUS | Fuel System At Adaptive Limits, HO2S Unable To Switch |
| 172 | KOER/CONTINUOUS | Lack Of HO2S Switches, Lean |
| 173 | KOER/CONTINUOUS | Lack Of HO2S Switches, Rich |
| 179 | CONTINUOUS | Fuel System At Lean Limit At Part Throttle, System Rich |
| 181 | CONTINUOUS | Fuel System At Rich Limit At Part Throttle, System Lean |
| 182 | CONTINUOUS | Fuel System At Lean Limit At Idle, System Rich |
| 183 | CONTINUOUS | Fuel System At Rich Limit At Idle, System Lean |
| 184 | CONTINUOUS | MAF High |
| 185 | CONTINUOUS | MAF Low |
| 186 | CONTINUOUS | Injector Pulse Width High |
| 187 | CONTINUOUS | Injector Pulse Width Low |
| 211 | CONTINUOUS | PIP Circuit Fault |
| 212 | CONTINUOUS | Loss Of IDM Input/SPOUT Circuit Grounded |
| 213 | KOER | SPOUT Circuit Open |
| 214 | CONTINUOUS | CID Circuit Failure |
| 215 | CONTINUOUS | Coil 1 Primary Circuit Failure |
| 216 | CONTINUOUS | Coil 2 Primary Circuit Failure |
| 218 | CONTINUOUS | Loss Of IDM Signal, Left Side |
| 222 | CONTINUOUS | Loss Of IDM Signal, Right Side |
| 223 | CONTINUOUS | Loss Of DPI Control |
| 224 | CONTINUOUS | Erratic IDM Input |
| 225 | KOER | Knock Not Sensed During Dynamic Response Test |
| 327 | KOEO/KOER/CONTINUOUS | EVP Circuit Low Voltage |
| 328 | KOEO/KOER/CONTINUOUS | EGR Closed Valve Voltage Low |
| 332 | KOER/CONTINUOUS | Insufficient EGR Flow |
| 334 | KOEO/KOER/CONTINUOUS | EGR Closed Valve Voltage High |
| 337 | KOEO/KOER/CONTINUOUS | EVP Circuit Voltage High |
| 341 | KOEO | Octane Adjust Service Pin In Use |
| 411 | KOER | Cannot Control RPM During KOER Low RPM Check |
| 412 | KOER | Cannot Control RPM During KOER High RPM Check |
| 452 | CONTINUOUS | Insufficient Input From VSS |
| 511 | KOEO | ECC ROM Test Failure |
| 512 | CONTINUOUS | ECC KAM Test Failure |
| 519 | KOEO | PSPS Circuit Open |
| 521 | KOER | PSPS Circuit Did Not Change |
| 522 | KOEO | Vehicle Not In Park Or Neutral During KOEO Test |
| 528 | CONTINUOUS | Clutch Switch Circuit Failure |
| 536 | KOER/CONTINUOUS | BOO Circuit Failure/Not Actuated During KOER Test |
| 538 | KOER | Insufficient RPM Change During Dynamic Response Test |
| 539 | KOEO | A/C On/Defrost On During KOEO Test |
| 542 | KOEO/CONTINUOUS | Fuel Pump Secondary Circuit Failure |
| 543 | KOEO/CONTINUOUS | Fuel Pump Secondary Circuit Failure |
| 556 | KOEO/CONTINUOUS | Fuel Pump Relay Primary Circuit Failure |
| 558 | KOEO | EVR Circuit Failure |
| 564 | KOEO | EDF Circuit Failure |
| 565 | KOEO | CANP Circuit Failure |
| 566 | KOEO | 3-4 Shift Solenoid Circuit Failure |
| 629 | KOEO | Converter Clutch Control Circuit Failure |
| 998 | KOER | Hard Fault Present - FMEM Mode |