P266A"A" Rocker Arm Actuator Position Sensor Circuit (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P266A is the basic circuit fault for the bank 2 position sensor of rocker arm actuator A. It only applies to engines that have a lift actuator with position feedback on each cylinder bank, which is rare; most switching rocker systems on V engines rely on oil pressure switches or none at all. No manufacturer documents P266A publicly, and even Toyota's Valvematic, which does use such feedback, is an inline design whose bulletins list a B code for its sensor. CARB still requires every electrical component of a lift system to be checked. If the controller loses this signal, it typically stops varying lift on bank 2, so power and refinement suffer.
- What you may notice
- MIL on
- Lift on bank 2 no longer adjusted
- Reduced power and smoothness
- Likely causes
- LikelyPoor contact at the bank 2 sensor connector
- PossibleDamaged wiring between sensor and engine controller
- PossibleFailed bank 2 position sensor
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €750
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.