P34B1A Camshaft Position Actuator Position Sensor A Range/Performance Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P34B1 means the intake-side position sensor A of bank 2 delivers an electrically sound but implausible value. No public manufacturer document uses this code. The nearest published example is the bank 1 code P34AD on the 2022 Mitsubishi Outlander, where the electric phaser module checks the motor position against the intake camshaft sensor and flags a mismatch. Mercedes uses the same fault type on the exhaust side for its CAMTRONIC lift actuators (P34BD, P34C1); bulletin LI05.20-P-080192 answers it with an engine software update and actuators of a newer part number. On bank 2 an actuator that binds or has worn, a lost learned position or a camshaft signal problem (compare P0021) are likely. The bank 2 phaser is then locked at its base angle.
- What you may notice
- Check engine light on
- Bank 2 intake timing fixed, reduced power
- Possibly further timing codes such as P0021
- Likely causes
- LikelyActuator on bank 2 sticking or worn
- PossibleLearned actuator position lost or software outdated
- PossibleBank 2 intake camshaft signal disturbed
- 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 – €1,100
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.