### P0420 Emissions Control Malfunction
– Typical Sources:
Worn catalytic converter [1]
– Common Solutions:
Repair exhaust system https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Vacuum leaks
– Testing Procedure:
Smoke test intake [1][7]
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## Vehicle Service Vocabulary
### Skid Prevention Technology
– Purpose: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Manages fuel injection [7]
### Drivetrain Components
– Includes: Transmission [7]
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## Repair Process Steps
1. **Symptom Assessment**:
Scan DTCs
2. **Part Evaluation**:
Measure resistance
3. **Parts Replacement**:
Use OEM parts
4. **System Validation**:
Confirm warning light reset
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Innova | Retrieve DTCs |
| Hand Instruments | Multimeter | Component repair |
—
## Repair Documentation Sources
### Mechanical Information System
– Capabilities:
Component locations [8]
OEM specifications
### Smartphone Tools
– Auto Repair Documents:
Electrical diagrams [5]
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## Cost-Saving Tips
– Routine checkups extends vehicle life
– Understand DTC meanings to prevent mechanic overselling
– Select certified components when OEM prices prohibitive [7]