P08B1Neutral Position Sensor B Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- How the car detects it
- Neutral position sensor B, the second neutral sensor or channel on a manual gearbox's shift shaft, delivers a signal that drops out or jumps for short moments. No manufacturer documents P08B1 publicly. The closest documented case is on the A sensor: Audi's bulletin for the 2019–20 Q3 and 2022–23 A3 traces P086D/P086E to wires to sender G701 that were too short, so every gear change strained them; lengthening by 20 mm cures it. A Dura patent notes that a neutral signal must persist for a minimum time before start-stop may stop the engine, so a flickering sensor blocks the function. CARB 1968.2 (e)(15) requires circuit monitoring. Steady faults appear as P08AD, P08AF or P08B0.
- What you may notice
- Start-stop works only now and then
- Occasional start system message
- Fault returns after clearing without visible cause
- Likely causes
- LikelyWire strained or partly broken by gearbox movement
- PossibleLoose or fretting connector contact
- RareSensor B with intermittent internal fault
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.