### P0420 Emissions Control Malfunction
– Common Causes:
Worn catalytic converter [1]
– Suggested Repairs:
Repair exhaust system https://carautorepair.site/
### P0171 System Too Lean
– Likely Problems:
Vacuum leaks
– Troubleshooting Process:
Check fuel pressure [1][7]
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## Car Maintenance Terms
### Electronic Braking System
– Function: Maintains steering control [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Controls ignition timing [7]
### Transmission System Parts
– Includes: Drive axles [7]
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## Repair Process Steps
1. **Initial Diagnosis**:
Scan DTCs
2. **Component Testing**:
Test continuity
3. **Defective Unit Swap**:
Clear error codes
4. **Final Quality Check**:
Confirm warning light reset
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | BlueDriver | Live data streaming |
| Mechanical Tools | Multimeter | Component repair |
—
## Service Information References
### Vehicle Service Database
– Features:
Wiring diagrams [8]
OEM specifications
### Smartphone Tools
– Vehicle Service App:
Component testing guides [5]
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## Cost-Saving Tips
– Regular maintenance prevents major failures
– Understand DTC meanings to prevent mechanic overselling
– Use aftermarket parts when budget constrained [7]
