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B128104 — Weather sensor (rain/light/moisture) – defective
Weather sensor (rain/light/moisture) – defective. 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 B128104
How to read and clear B128104
- 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 B128104 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 Central Electrics
| B126629 | Rear window defogger button, Implausible signal |
| B126A04 | Main light switches – defective |
| B126A29 | Main light switches – signal implausible |
| B126AF0 | Main light switches – button status implausible |
| B126AF1 | Main light switches – button status implausible |
| B126AF2 | Main light switches – part number implausible |
| B12A104 | Left indirect ventilation flap motor, Faulty |
| B12A107 | Left indirect ventilation flap motor, mechanical malfunction |
| B12A11C | Left indirect ventilation flap motor, Voltage implausible |
| B12A121 | Left indirect ventilation flap motor, Lower limit not reached |
| B12A122 | Left indirect ventilation flap motor, Upper limit exceeded |
| B12A14B | Left indirect ventilation flap motor, Excess temp. |
All 1472 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.