### P0420 Catalytic Converter Issue
– Frequent Reasons:
Faulty oxygen sensor [1]
– Recommended Fixes:
Diagnose fuel trim https://carautorepair.site/
### P0171 System Too Lean
– Likely Problems:
Faulty MAF sensor
– Troubleshooting Process:
Check fuel pressure [1][7]
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## Car Maintenance Terms
### ABS (Anti-Lock Brake System)
– Function: Maintains steering control [7]
### Vehicle Computer System
– Responsibility: Manages fuel injection [7]
### Drivetrain Components
– Includes: Transmission [7]
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## Repair Process Steps
1. **Initial Diagnosis**:
Conduct road test
2. **Component Testing**:
Check voltage
3. **Parts Replacement**:
Clear error codes
4. **Post-Repair Verification**:
Confirm warning light reset
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Autel | Live data streaming |
| Mechanical Tools | Smoke machine | Electrical testing |
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## Repair Documentation Sources
### Auto Repair Source
– Features:
Wiring diagrams [8]
Factory repair procedures
### Mobile Applications
– Auto Repair Documents:
Electrical diagrams [5]
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## Cost-Saving Tips
– Preventative service prevents major failures
– Understand DTC meanings to prevent mechanic overselling
– Install quality alternatives when OEM prices prohibitive [7]