### P0420 Emissions Control Malfunction
– Typical Sources:
Faulty oxygen sensor [1]
– Common Solutions:
Diagnose fuel trim https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Potential Issues:
Faulty MAF sensor
– Troubleshooting Process:
Smoke test intake [1][7]
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## Car Maintenance Terms
### ABS (Anti-Lock Brake System)
– Function: Prevents wheel lockup [7]
### Engine Management Unit
– Responsibility: Manages fuel injection [7]
### Drivetrain Components
– Includes: Drive axles [7]
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## Repair Process Steps
1. **Symptom Assessment**:
Perform visual inspection
2. **Component Testing**:
Check voltage
3. **Defective Unit Swap**:
Follow torque specs
4. **Final Quality Check**:
Ensure proper operation
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Innova | Retrieve DTCs |
| Mechanical Tools | Multimeter | Electrical testing |
—
## Technical Data Resources
### Auto Repair Source
– Features:
Wiring diagrams [8]
OEM specifications
### Digital Assistants
– Vehicle Service App:
Component testing guides [5]
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## Affordable Maintenance Advice
– Regular maintenance extends vehicle life
– Master code scanning to prevent mechanic overselling
– Select certified components when OEM prices prohibitive [7]