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C121F13 — Fan power supply - open circuit
Fan power supply - open circuit. The Taycan, 911 (992), Panamera (971), Panamera (972) and Cayenne report this code; below is which control unit sets it on each model and how to read and clear it.
Which models and control units set C121F13
How to read and clear C121F13
- Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
- Open STEUER14, pick your car and run a fault scan: every control unit is read, and C121F13 shows with its status, its full description and the freeze frame when the unit stores one.
- Fix the cause first, then clear the fault memory and scan again to check it stays away. Reading and clearing fault codes is free on every control unit.
More about fault memory in the manual →
Download STEUER14 — free fault readingOther codes of the Light Control Left
| C11F901 | Dipped beam headlight - electrical fault |
| C11FA01 | Static cornering light - electrical fault |
| C11FB01 | High beam headlight - electrical fault |
| C11FD13 | Power supply for dipped beam headlight - open circuit |
| C11FE13 | Static cornering light - open circuit in power supply |
| C11FF13 | High beam - power supply, open circuit |
| C123313 | Supply for matrix high beam, Open circuit |
| C123A01 | Daytime-running/marker lights – electrical fault |
| C123A13 | Daytime running / front marker light – open circuit |
| C123A4B | Bulb for daytime running light & park. light, excessive temperature |
| C123AF0 | Daytime running/marker lights temperature sensor – electrical fault |
| C123AF1 | Daytime running / marker light, coding resistance – electrical fault |
All 223 codes of this control unit →
Fault names come from the manufacturer's diagnostic data. STEUER14 is independent and not affiliated with Porsche AG. A code tells you what a control unit detected, not always which part failed — check wiring, supply voltage and related codes before replacing parts. STEUER14 shows each fault's full description, status and freeze frame on the car.