Camshaft Position Actuator Bank 2 Tight
2004-2004 BMW 325i 2.5L I6 M54
The 2004 BMW 325i is equipped with a 2.5L inline-6 engine. Below you'll find detailed p1521 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The DME detected that the intake camshaft position actuator (VANOS unit) on Bank 2 is mechanically tight or seized. The actuator cannot achieve its target position within the expected time.
Symptoms
- Check Engine Light
- VANOS rattle
- Power loss at low RPM
- Rough idle
- Reduced fuel economy
Common Causes
- Worn VANOS unit seals Bank 2
- Oil sludge in VANOS
- Failing VANOS solenoid Bank 2
- Insufficient oil pressure
- Internal VANOS wear
Diagnostic Steps
- Listen for VANOS rattle
- Check oil level and quality
- Monitor VANOS position Bank 2
- Test VANOS solenoid Bank 2
- Check oil pressure
Repair Notes
Rebuild or replace the VANOS unit on Bank 2.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1521 on Other Vehicles
Common Questions
What does code P1521 mean on a 2004-2004 BMW 325i?
P1521 stands for "Camshaft Position Actuator Bank 2 Tight". The DME detected that the intake camshaft position actuator (VANOS unit) on Bank 2 is mechanically tight or seized. The actuator cannot achieve its target position within the expected time.
What are the symptoms of P1521 on a BMW 325i?
Common symptoms of P1521 include: Check Engine Light, VANOS rattle, Power loss at low RPM, Rough idle, Reduced fuel economy.
What causes P1521 on a 2004-2004 BMW 325i?
Common causes of P1521 include: Worn VANOS unit seals Bank 2, Oil sludge in VANOS, Failing VANOS solenoid Bank 2, Insufficient oil pressure, Internal VANOS wear.
Last updated: March 2026