### P0420 Emissions Control Malfunction
– Typical Sources:
Worn catalytic converter [1]
– Recommended Fixes:
Replace catalytic converter https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Potential Issues:
Faulty MAF sensor
– Testing Procedure:
Check fuel pressure [1][7]
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## Vehicle Service Vocabulary
### ABS (Anti-Lock Brake System)
– Purpose: Prevents wheel lockup [7]
### Engine Management Unit
– Role: Manages fuel injection [7]
### Transmission System Parts
– Includes: Differential [7]
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## Mechanical Fixing Workflow
1. **Symptom Assessment**:
Perform visual inspection
2. **Component Testing**:
Measure resistance
3. **Defective Unit Swap**:
Use OEM parts
4. **Post-Repair Verification**:
Ensure proper operation
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Autel | Live data streaming |
| Hand Instruments | Smoke machine | Component repair |
—
## Repair Documentation Sources
### Vehicle Service Database
– Capabilities:
TSB access [8]
OEM specifications
### Digital Assistants
– Vehicle Service App:
Electrical diagrams [5]
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## Cost-Saving Tips
– Routine checkups avoids costly repairs
– Learn basic diagnostics to prevent mechanic overselling
– Select certified components when OEM prices prohibitive [7]
