Ford OBD-I Codes
1981-1995 Ford, Lincoln and Mercury EEC-IV. 278 codes. Two-digit self-test codes. Jumper the self-test input, key on, count the flashes.
How to read Ford codes
- Find the self-test connector under the hood, usually at the firewall or on a front fender apron.
- Jumper the self-test input to signal return with a paperclip or a short wire.
- Key on, engine off. Count the check-engine flashes. Code 11 means the system passed.
- Start the engine and read the running self test the same way.
- Continuous memory codes come after a six second delay and a single half second flash. Look each code up below, then remove the jumper.
New to this? How to read OBD-I codes without a scanner walks through the paperclip method, code 12, and reading two-digit codes.
Popular Ford codes
- 11: System pass, no fault found during self test
- 14: Profile ignition pickup circuit failure
- 21: Engine coolant temperature sensor out of self test range
- 33: EGR valve not closing properly or EGR valve opening not detected
- 41: Fuel system indicates lean or oxygen sensor not switching
- 51: Engine coolant temperature circuit open
- 63: Throttle position sensor circuit below minimum voltage
- 87: Primary fuel pump circuit failure
Ford (278)
Powertrain - Computer and Auxiliary Controls
Powertrain - Ignition
Powertrain - Fuel/Air Metering
- 21
- 22
- 23
- 24
- 26
- 36
- 37
- 41
- 42
- 43
- 51
- 53
- 54
- 56
- 61
- 63
- 64
- 66
- 72
- 73
- 76
- 85
- 87
- 95
- 96
- 112
- 113
- 114
- 116
- 117
- 118
- 121
- 122
- 123
- 124
- 125
- 126
- 128
- 129
- 136
- 137
- 138
- 139
- 141
- 144
- 157
- 158
- 159
- 167
- 171
- 172
- 173
- 174
- 175
- 176
- 177
- 178
- 179
- 181
- 182
- 183
- 184
- 185
- 186
- 187
- 188
- 189
- 191
- 192
- 193
- 338
- 339
- 524
- 542
- 543
- 554
- 556
- 557
- 583
- 593
Powertrain - Other
Powertrain - Auxiliary Emissions Controls
Powertrain - Transmission
- 39
- 57
- 59
- 62
- 65
- 67
- 69
- 70
- 86
- 89
- 91
- 92
- 93
- 94
- 97
- 99
- 490
- 566
- 590
- 617
- 618
- 619
- 620
- 621
- 622
- 623
- 624
- 626
- 627
- 628
- 629
- 631
- 632
- 634
- 636
- 637
- 638
- 639
- 641
- 643
- 645
- 646
- 647
- 648
- 649
- 650
- 651
- 652
- 653
- 654
- 655
- 656
- 657
- 659
- 662
- 667
- 668
- 670
- 675
- 680
- 690
- 920
- 930
- 940
- 980
- 990