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B133A13 — Left brake/tail lamp bulb, Open circuit
Left brake/tail lamp bulb, 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 B133A13
How to read and clear B133A13
- 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 B133A13 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 Comfort System Module
| B133613 | Right brake light/direction indicator light in tailgate – open circuit |
| B133615 | Right brake light/direction indicator light in tailgate – short circuit to B+ or open circuit |
| B133713 | Tailgate proximity sensors – open circuit |
| B133801 | Bottom tailgate proximity sensor – electrical fault |
| B133A11 | Lamp for left brake and tail light – short circuit to ground |
| B133A12 | Lamp for left brake and tail light – short circuit to B+ |
| B133A15 | Left brake/tail lamp bulb, Open circuit/short circuit to B+ |
| B133B11 | Left brake/tail lamp bulb 2, Short circuit to ground |
| B133B12 | Left brake/tail lamp bulb 2, Short circuit to B+ |
| B133B13 | Left brake/tail lamp bulb 2, Open circuit |
| B133B15 | Left brake/tail lamp bulb 2, Open circuit/short circuit to B+ |
| B133C11 | Right brake/tail lamp bulb, Short circuit to ground |
All 616 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.