Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car's engine has a part called a camshaft that helps it run smoothly. This code means that the camshaft on one side of the engine is not in the right position, and it's moving too far ahead of where it should be.
The engine's camshaft timing is advanced beyond the expected range, affecting engine performance.
The P0021 code indicates that the Engine Control Module (ECM) has detected the camshaft timing for bank 2 is over-advanced. This can occur due to issues with the Variable Valve Timing (VVT) system, which adjusts the camshaft position to optimize engine performance.
• Check Engine Light is on
• Rough engine idle
• Reduced engine performance
• Faulty camshaft position sensor
• Timing chain or belt issues
• Problems with the Variable Valve Timing (VVT) solenoid
Camshaft: A shaft in the engine that controls the opening and closing of the valves.
VVT: Variable Valve Timing, a system that adjusts the timing of the camshaft for better performance.
• Use an OBD-II scanner to confirm the code.
• Inspect the camshaft position sensor and wiring.
• Check the VVT solenoid for proper operation.
• Replace the camshaft position sensor if faulty.
• Repair or replace the timing chain or belt if needed.
• Clean or replace the VVT solenoid.
• OBD-II scanner
• Multimeter
• Wrench set
$200 - $600
Moderate
• Nissan Altima
• Infiniti G35
• Subaru Outback
• Regularly change engine oil and filter.
• Inspect timing components periodically.
• Use high-quality oil to prevent sludge.
Engine Performance
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult a professional mechanic for accurate diagnosis.
Check if your vehicle is still under powertrain warranty, which may cover this repair.
The P0021 code has been commonly reported in vehicles with high mileage or poor maintenance history.
Moderate – Should be addressed soon to prevent potential engine damage.
Driving with this code can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in idle and various RPM ranges
The camshaft position sensor and VVT solenoid are typically located near the top of the engine, on the cylinder head of bank 2.
Q: Can I drive my car with a P0021 code?
A: It's not recommended to drive with this code as it can lead to engine damage.
Q: How can I prevent a P0021 code?
A: Regular maintenance, including timely oil changes and inspections, can help prevent this code.
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