Temperature sensor of exhaust cam actuator on bank 2 reads implausibly. The camshaft position sensor identifies which cylinder is on the compression stroke — without it the ECM cannot run sequential injection or coil-on-plug ignition correctly.
Medium severity. Can I keep driving?Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.
Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Most likely causes
- Sensor reading drifted
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It affects emissions.
What each character of P34B9 means
- P: Powertrain: engine and transmission
- 3: Generic or manufacturer code, depending on the range
- 4: Emissions
- B9: Specific fault in that system
Frequently asked questions
Can I keep driving with code P34B9?
Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.
What causes code P34B9?
The most common causes are: sensor reading drifted; sensor element aged beyond calibration window; sensor mounting loose - signal damping.
Related codes
- P34B5B Camshaft Position Actuator Temperature Sensor Range/Performance Bank 1
- P34A9A Camshaft Position Actuator Temperature Sensor Range/Performance Bank 2
- P34A5A Camshaft Position Actuator Temperature Sensor Range/Performance Bank 1
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.