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C123BFB — Front marker light, above normal temperature
Front marker light, above normal temperature. 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 C123BFB
How to read and clear C123BFB
- 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 C123BFB 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
| C123BF0 | Front marker light, coding resistance – electrical fault |
| C123BF1 | Front marker light, temperature sensor – electrical fault |
| C123BF2 | Front marker light – voltage too high |
| C123BF3 | Front marker light – voltage too low |
| C123BF7 | Bulb for parking light, Overtemperature protection active |
| C123BFA | Front marker light – short circuit |
| C123BFC | Front marker light, below normal temperature |
| C125301 | LED-activation interface, Electrical error |
| C127504 | Module for external sensors, faulty |
| C127517 | Module for external sensors, voltage too high |
| C128301 | Auxiliary headlight – electrical fault |
| C128304 | Laser beam, faulty |
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.