### P0420 Catalytic Converter Issue
– Common Causes:
Faulty oxygen sensor [1]
– Recommended Fixes:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Potential Issues:
Vacuum leaks
– Testing Procedure:
Check fuel pressure [1][7]
—
## Car Maintenance Terms
### Skid Prevention Technology
– Function: Prevents wheel lockup [7]
### Vehicle Computer System
– Responsibility: Controls ignition timing [7]
### Transmission System Parts
– Contains: Differential [7]
—
## Service Procedure Stages
1. **Initial Diagnosis**:
Conduct road test
2. **Component Testing**:
Test continuity
3. **Parts Replacement**:
Use OEM parts
4. **System Validation**:
Ensure proper operation
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Innova | Live data streaming |
| Physical Equipment | Torque wrench | Electrical testing |
—
## Repair Documentation Sources
### Vehicle Service Database
– Features:
Wiring diagrams [8]
OEM specifications
### Smartphone Tools
– Auto Repair Documents:
Electrical diagrams [5]
—
## Cost-Saving Tips
– Routine checkups prevents major failures
– Understand DTC meanings to avoid unnecessary repairs
– Use aftermarket parts when budget constrained [7]
