### P0420 Catalyst System Efficiency Below Threshold
– Common Causes:
Exhaust leaks [1]
– Common Solutions:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Vacuum leaks
– Troubleshooting Process:
Smoke test intake [1][7]
—
## Car Maintenance Terms
### ABS (Anti-Lock Brake System)
– Function: Prevents wheel lockup [7]
### Engine Management Unit
– Responsibility: Controls ignition timing [7]
### Drivetrain Components
– Contains: Transmission [7]
—
## Repair Process Steps
1. **Initial Diagnosis**:
Conduct road test
2. **Component Testing**:
Test continuity
3. **Parts Replacement**:
Follow torque specs
4. **Post-Repair Verification**:
Confirm warning light reset
—
## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Autel | Live data streaming |
| Physical Equipment | Torque wrench | Component repair |
—
## Technical Data Resources
### Mechanical Information System
– Capabilities:
Component locations [8]
Factory repair procedures
### Smartphone Tools
– Auto Repair Documents:
Electrical diagrams [5]
—
## Affordable Maintenance Advice
– Regular maintenance extends vehicle life
– Understand DTC meanings to prevent mechanic overselling
– Select certified components when budget constrained [7]