P264A"A" Rocker Arm Actuator Position Sensor Circuit (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Some valve lift systems report back where the rocker arm actuator actually is, rather than relying on oil pressure; continuously variable designs driven by an electric motor, such as Toyota Valvematic, work this way. P264A is the general circuit fault for the position sensor of actuator A on bank 1: signal missing or implausible without a clear low or high pattern. No manufacturer documents this code publicly with thresholds; Toyota's Valvematic bulletin T-SB-0098-19 files its sensor fault under the B sensor code P265B. CARB demands monitoring of all electrical parts of such systems. Without valid feedback the controller usually freezes lift at a safe value, costing power and fuel economy.
- What you may notice
- MIL on
- Lift held at a fixed value, less power
- Higher fuel consumption
- Likely causes
- LikelyLoose or corroded position sensor connector
- PossibleDamaged signal, supply or ground wire
- PossiblePosition sensor failed internally
- 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 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.