### P0420 Emissions Control Malfunction
– Typical Sources:
Exhaust leaks [1]
– Suggested Repairs:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Vacuum leaks
– Diagnostic Steps:
Inspect injectors [1][7]
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## Auto Repair Terminology
### Skid Prevention Technology
– Purpose: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Role: Controls ignition timing [7]
### Drivetrain Components
– Includes: Differential [7]
—
## Mechanical Fixing Workflow
1. **Initial Diagnosis**:
Conduct road test
2. **System Verification**:
Check voltage
3. **Parts Replacement**:
Clear error codes
4. **System Validation**:
Test drive vehicle
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | BlueDriver | Retrieve DTCs |
| Hand Instruments | Smoke machine | Component repair |
—
## Service Information References
### Vehicle Service Database
– Capabilities:
Component locations [8]
Technical illustrations
### Mobile Applications
– Vehicle Service App:
Component testing guides [5]
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## Cost-Saving Tips
– Regular maintenance avoids costly repairs
– Master code scanning to avoid unnecessary repairs
– Use aftermarket parts when OEM prices prohibitive [7]