### P0420 Emissions Control Malfunction
– Common Causes:
Worn catalytic converter [1]
– Suggested Repairs:
Replace catalytic converter https://carautorepair.site/
### P0171 System Too Lean
– Possible Defects:
Vacuum leaks
– Troubleshooting Process:
Smoke test intake [1][7]
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## Auto Repair Terminology
### ABS (Anti-Lock Brake System)
– Function: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Role: Monitors sensors [7]
### Transmission System Parts
– Includes: Differential [7]
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## Repair Process Steps
1. **Problem Identification**:
Scan DTCs
2. **System Verification**:
Test continuity
3. **Defective Unit Swap**:
Use OEM parts
4. **Final Quality Check**:
Test drive vehicle
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | BlueDriver | Retrieve DTCs |
| Hand Instruments | Torque wrench | Electrical testing |
—
## Service Information References
### Auto Repair Source
– Features:
Component locations [8]
OEM specifications
### Smartphone Tools
– Vehicle Service App:
Electrical diagrams [5]
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## Budget Repair Strategies
– Regular maintenance extends vehicle life
– Master code scanning to avoid unnecessary repairs
– Install quality alternatives when budget constrained [7]