### P0420 Catalytic Converter Issue
– Frequent Reasons:
Worn catalytic converter [1]
– Common Solutions:
Repair exhaust system https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Potential Issues:
Faulty MAF sensor
– Troubleshooting Process:
Inspect injectors [1][7]
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## Auto Repair Terminology
### Skid Prevention Technology
– Purpose: Prevents wheel lockup [7]
### Engine Management Unit
– Role: Monitors sensors [7]
### Drivetrain Components
– Contains: Drive axles [7]
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## Service Procedure Stages
1. **Symptom Assessment**:
Conduct road test
2. **System Verification**:
Check voltage
3. **Defective Unit Swap**:
Clear error codes
4. **Final Quality Check**:
Confirm warning light reset
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | BlueDriver | Live data streaming |
| Mechanical Tools | Torque wrench | Electrical testing |
—
## Service Information References
### Auto Repair Source
– Capabilities:
Wiring diagrams [8]
OEM specifications
### Smartphone Tools
– Auto Repair Documents:
ECU pinouts [5]
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## Cost-Saving Tips
– Routine checkups prevents major failures
– Master code scanning to avoid unnecessary repairs
– Select certified components when budget constrained [7]
