Citroen OBD1 Trouble Codes
The following trouble codes are specific to Citroen. You may also see Peugeot trouble codes, since Citroen and Peugeot are of the same parent company.
Prior to the introduction of mandatory OBD2 systems in Europe, Peugeot Citroen Group PSA used a 2-pin DLC connector for many of their models up until around 1997 and a 30-pin DLC connector until the early 2000's. All 2-pin DLCs allowed reading of 2 digit flash codes, whereas only some 30-pin DLCs allowed reading of 2 digit flash codes.
Flash codes give the operator a reading of the code by turning on and off voltage to a test device such as a lamp, oscilloscope or fault code reader. They are not very sophisticated and quite slow, however they can be read by anyone with very basic equipment and by taking basic precautions.
The trouble codes generated by Peugeot and Citroen are 2 digits long and manifest as a series of on and off pulses given through a green 2-pin data link connector (DLC). On the specific car under test in this instructable this code also gets flashed through the check engine light, although this is not always the case.
When reading a sequence of codes there will always be at least two codes indicated. These are codes 12 and 11, in that order. If these codes appear alone then no actual fault codes have been logged. If actual fault codes have been logged they will appear between code 12 and 11.
The 2 digit codes manifest themselves as such:
- The first digit comes as a flash (or series of flashes in quick succession)
- This is followed by a pause of about 1.5 seconds
- The second digit comes as a flash (or series of flashes in quick succession)
Codes are separated by at least 3 seconds.
Citroen Informational Codes
- Click the table header to sort the table data by the respective column heading.
- Type keyword(s) in the table’s search box for a quick display of the searched data.
| Code(s) | Description |
|---|---|
| 11 | End of codes. This code always appears. Actual faults come before this code. |
| 12 | Beginning of codes. This code always appears. Actual faults come after this code. |
Citroen Trouble Codes
- Click the table header to sort the table data by the respective column heading.
- Type keyword(s) in the table’s search box for a quick display of the searched data.
| Code(s) | Description |
|---|---|
| 13 | Intake air temperature sensor or circuit |
| 14 | Engine coolant temperature sensor or circuit |
| 21 | Throttle position sensor or circuit |
| 22 | Idle speed regulator |
| 31 | Oxygen sensor or circuit |
| 33 | Manifold absolute pressure sensor or circuit |
| 41 | Crankshaft position sensor or circuit |
| 42 | Injector or circuit |
| 51 | Oxygen sensor or circuit |
| 52 | Mixture control, supply voltage, air or exhaust leak |
| 53 | Battery voltage incorrect |
| 54 | ECM failure |
| 81 or 91 | Fuel pump, relay and circuit |
| 82 or 92 | Injector and injector circuit |
| 83 or 93 | Idle speed control valve and circuit |
| 84 or 94 | Carbon filter solenoid and circuit |
| 85 or 95 | Air conditioning compressor, relay and circuit |
| 86 or 96 | Variable air intake and circuit (A) |
| 87 or 97 | Variable air intake and circuit (B) |