Automotive Flow Chart

flowchart TD
    A[Emissions Issue] --> B[Check Engine Light]
    B -->|P0420-P0430| C[Catalyst Efficiency]
    B -->|P0440-P0457| D[EVAP System]
    B -->|P0400-P0408| E[EGR System]

    C -->|Low Efficiency| C1[Check O2 Sensors]
    C -->|Physical Damage| C2[Inspect Catalyst]
    C -->|Engine Misfire| C3[Check Engine]
    C1 -->|Bad Sensor| C4[Replace Sensor]
    C2 -->|Failed Cat| C5[Replace Catalyst]

    D -->|Leak Detected| D1[Smoke Test]
    D -->|Flow Issue| D2[Check Purge Valve]
    D -->|Cap Issue| D3[Check Gas Cap]
    D1 -->|Found Leak| D4[Repair/Replace]
    D2 -->|Stuck Valve| D5[Replace Valve]

    E -->|No Flow| E1[Check Valve]
    E -->|Flow Issue| E2[Check Passages]
    E -->|Electronic| E3[Check Solenoid]
    E1 -->|Carbon| E4[Clean/Replace]
    E2 -->|Clogged| E5[Clean Passages]

    C3 -->|Found Issue| C6[Repair Engine]
    D3 -->|Bad Cap| D6[Replace Cap]
    E3 -->|Failed| E6[Replace Solenoid]