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Home >> Subaru >> 2021 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (2.5L) - Introduction >> Drive Cycle >> Procedure >> Drive Cycle G
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Drive Cycle G

DTC Item Condition Number of driving cycles on the detecting condition
P0410 SECONDARY AIR SYSTEM - 2
P0411 SECONDARY AIR SYSTEM INCORRECT FLOW DETECTED - 2
P0414 SECONDARY AIR SYSTEM SWITCHING VALVE "A" CIRCUIT SHORTED - 1
P0417 SECONDARY AIR SYSTEM SWITCHING VALVE "B" CIRCUIT SHORTED - 1
P1410 SECONDARY AIR INJECTION SYSTEM COMBINATION VALVE STUCK OPEN - 1
P2258 SECONDARY AIR SYSTEM CONTROL "A" CIRCUIT HIGH - 1
P2440 SECONDARY AIR SYSTEM SWITCHING VALVE STUCK OPEN BANK 1 - 2
P2441 SECONDARY AIR SYSTEM SWITCHING VALVE STUCK CLOSED BANK 1 - 2
P2442 SECONDARY AIR SYSTEM SWITCHING VALVE STUCK OPEN BANK 2 - 2
P2443 SECONDARY AIR SYSTEM SWITCHING VALVE STUCK CLOSED BANK 2 - 2
  1. Disconnect the battery negative terminal, and reconnect after at least 10 seconds have passed.
  2. Idle the engine until engine coolant temperature is 80°C (176°F) or more.
  3. Stop the engine to decrease the engine coolant temperature down to 40°C (104°F) or less.
    NOTE: Do not let engine coolant temperature drop to 5°C (41°F) or less.
  4. Idle the engine until engine coolant temperature is 80°C (176°F) or more.
  5. Stop the engine to decrease the engine coolant temperature down to 40°C (104°F) or less.
    NOTE: Do not let engine coolant temperature drop to 5°C (41°F) or less.
  6. Idle the engine.
  7. Read the temporary code using the Subaru Select Monitor or general scan tool. Refer to ENGINE (DIAGNOSTICS) (STI)>READ DIAGNOSTIC TROUBLE CODE (DTC)>OPERATION .
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