### P0420 Emissions Control Malfunction
– Typical Sources:
Exhaust leaks [1]
– Suggested Repairs:
Diagnose fuel trim https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Potential Issues:
Vacuum leaks
– Testing Procedure:
Check fuel pressure [1][7]
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## Car Maintenance Terms
### Skid Prevention Technology
– Function: Prevents wheel lockup [7]
### Engine Management Unit
– Responsibility: Manages fuel injection [7]
### Drivetrain Components
– Includes: Transmission [7]
—
## Repair Process Steps
1. **Initial Diagnosis**:
Conduct road test
2. **Part Evaluation**:
Measure resistance
3. **Defective Unit Swap**:
Use OEM parts
4. **Post-Repair Verification**:
Ensure proper operation
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Autel | Live data streaming |
| Physical Equipment | Torque wrench | Electrical testing |
—
## Service Information References
### Vehicle Service Database
– Capabilities:
Wiring diagrams [8]
OEM specifications
### Smartphone Tools
– Vehicle Service App:
Electrical diagrams [5]
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## Affordable Maintenance Advice
– Routine checkups avoids costly repairs
– Understand DTC meanings to prevent mechanic overselling
– Use aftermarket parts when budget constrained [7]
