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Diagnostic Case Summary

Subaru Tribeca B9 2007 P0011 P0021

In progress

Automotive - Internal Combustion Engine · Started Aug 18, 2026 · by Anton

Diagnostics

Subaru Tribeca B9 Active Valve Control System Issues
Confirmed
Subaru Tribeca B9 P0021 Due to Clogged AVCS Oil Filter Screen
Ruled out
Subaru Tribeca B9 P0021 Due to Dirty or Low Engine Oil
Ruled out
Subaru Tribeca B9 P0021 Due to Oil Control Valve Malfunction
Ruled out

Remedies

Execute a Professional Engine Oil System Flush
Tried — did not resolve
Inspect and Repair Bank 2 VVT Solenoid Wiring Harness
Tried — did not resolve
Perform an Engine Oil and Filter Change
Tried — did not resolve
Top Off Engine Oil and Verify System Pressure
Tried — did not resolve
Verify Mechanical Timing and Camshaft Gear Integrity
Tried — did not resolve

Diagnostics and Remedies considered but not confirmed

Replace Bank 2 Intake Camshaft Position Sensor
Remedy considered
Subaru Tribeca B9 P0021 Intake Camshaft Over-Advanced Symptom
Diagnostic considered