Home › Fault codes › B156A04
B156A04 — Humidity sensor in fresh air intake duct, Faulty
Humidity sensor in fresh air intake duct, Faulty. 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 B156A04
How to read and clear B156A04
- 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 B156A04 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
| B1568F0 | Switch module for driver side seat, Event in plate, vertical actuation direction |
| B1568F1 | Switch module for driver side seat, Event in plate, horizontal actuation direction |
| B1568F2 | Switch module for driver side seat, Event in rocker |
| B1569F0 | Switch module for passenger side seat, Event in plate, vertical actuation direction |
| B1569F1 | Switch module for passenger side seat, Event in plate, horizontal actuation direction |
| B1569F2 | Switch module for passenger side seat, Event in rocker |
| B156B04 | Front A/C display control head, Faulty |
| B156B16 | Front A/C display control head, Voltage too low |
| B156B17 | Front A/C display control head, voltage too high |
| B156BF1 | Front A/C display control head, Button jammed |
| B156C04 | Rear left air distribution servomotor, Faulty |
| B156C07 | Rear left air distribution servomotor, mechanical malfunction |
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.