### P0420 Catalytic Converter Issue
– Common Causes:
Worn catalytic converter [1]
– Suggested Repairs:
Diagnose fuel trim https://carautorepair.site/
### P0171 System Too Lean
– Likely Problems:
Faulty MAF sensor
– Diagnostic Steps:
Check fuel pressure [1][7]
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## Auto Repair Terminology
### ABS (Anti-Lock Brake System)
– Purpose: Maintains steering control [7]
### Engine Management Unit
– Responsibility: Manages fuel injection [7]
### Drivetrain Components
– Contains: Drive axles [7]
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## Mechanical Fixing Workflow
1. **Initial Diagnosis**:
Conduct road test
2. **System Verification**:
Measure resistance
3. **Defective Unit Swap**:
Follow torque specs
4. **System Validation**:
Test drive vehicle
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | BlueDriver | Retrieve DTCs |
| Physical Equipment | Multimeter | Component repair |
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## Technical Data Resources
### Mechanical Information System
– Features:
Wiring diagrams [8]
Factory repair procedures
### Smartphone Tools
– Auto Repair Documents:
ECU pinouts [5]
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## Cost-Saving Tips
– Routine checkups extends vehicle life
– Understand DTC meanings to avoid unnecessary repairs
– Install quality alternatives when budget constrained [7]