### P0420 Catalytic Converter Issue
– Frequent Reasons:
Faulty oxygen sensor [1]
– Suggested Repairs:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Fuel delivery problems
– Testing Procedure:
Check fuel pressure [1][7]
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## Vehicle Service Vocabulary
### ABS (Anti-Lock Brake System)
– Purpose: Maintains steering control [7]
### Engine Management Unit
– Responsibility: Manages fuel injection [7]
### Transmission System Parts
– Includes: Transmission [7]
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## Service Procedure Stages
1. **Initial Diagnosis**:
Conduct road test
2. **Part Evaluation**:
Measure resistance
3. **Component Installation**:
Follow torque specs
4. **System Validation**:
Ensure proper operation
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | BlueDriver | Retrieve DTCs |
| Physical Equipment | Multimeter | Component repair |
—
## Repair Documentation Sources
### Mechanical Information System
– Capabilities:
TSB access [8]
Factory repair procedures
### Mobile Applications
– Auto Repair Documents:
Component testing guides [5]
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## Cost-Saving Tips
– Routine checkups avoids costly repairs
– Master code scanning to prevent mechanic overselling
– Install quality alternatives when OEM prices prohibitive [7]