### P0420 Catalyst System Efficiency Below Threshold
– Frequent Reasons:
Worn catalytic converter [1]
– Common Solutions:
Replace catalytic converter https://carautorepair.site/
### P0171 System Too Lean
– Potential Issues:
Fuel delivery problems
– Testing Procedure:
Inspect injectors [1][7]
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## Auto Repair Terminology
### Skid Prevention Technology
– Function: Enables safe braking [7]
### Engine Management Unit
– Responsibility: Manages fuel injection [7]
### Powertrain Elements
– Includes: Differential [7]
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## Service Procedure Stages
1. **Problem Identification**:
Conduct road test
2. **System Verification**:
Check voltage
3. **Defective Unit Swap**:
Clear error codes
4. **Final Quality Check**:
Ensure proper operation
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | BlueDriver | Retrieve DTCs |
| Mechanical Tools | Smoke machine | Component repair |
—
## Technical Data Resources
### Vehicle Service Database
– Capabilities:
Wiring diagrams [8]
Technical illustrations
### Digital Assistants
– Auto Repair Documents:
Electrical diagrams [5]
—
## Budget Repair Strategies
– Routine checkups prevents major failures
– Understand DTC meanings to prevent mechanic overselling
– Use aftermarket parts when budget constrained [7]
