### P0420 Catalytic Converter Issue
– Typical Sources:
Faulty oxygen sensor [1]
– Suggested Repairs:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Possible Defects:
Vacuum leaks
– Troubleshooting Process:
Check fuel pressure [1][7]
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## Auto Repair Terminology
### ABS (Anti-Lock Brake System)
– Purpose: Prevents wheel lockup [7]
### Vehicle Computer System
– Role: Manages fuel injection [7]
### Transmission System Parts
– Includes: Differential [7]
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## Repair Process Steps
1. **Initial Diagnosis**:
Scan DTCs
2. **Component Testing**:
Check voltage
3. **Parts Replacement**:
Follow torque specs
4. **System Validation**:
Confirm warning light reset
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | BlueDriver | Retrieve DTCs |
| Physical Equipment | Smoke machine | Component repair |
—
## Technical Data Resources
### Vehicle Service Database
– Capabilities:
TSB access [8]
Factory repair procedures
### Smartphone Tools
– Auto Repair Documents:
Component testing guides [5]
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## Affordable Maintenance Advice
– Preventative service prevents major failures
– Learn basic diagnostics to avoid unnecessary repairs
– Select certified components when budget constrained [7]
