### P0420 Catalytic Converter Issue
– Typical Sources:
Faulty oxygen sensor [1]
– Common Solutions:
Repair exhaust system https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Potential Issues:
Faulty MAF sensor
– Troubleshooting Process:
Smoke test intake [1][7]
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## Vehicle Service Vocabulary
### Electronic Braking System
– Function: Maintains steering control [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Monitors sensors [7]
### Powertrain Elements
– Includes: Differential [7]
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## Service Procedure Stages
1. **Initial Diagnosis**:
Scan DTCs
2. **System Verification**:
Test continuity
3. **Defective Unit Swap**:
Clear error codes
4. **Post-Repair Verification**:
Test drive vehicle
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Innova | Live data streaming |
| Physical Equipment | Smoke machine | Electrical testing |
—
## Repair Documentation Sources
### Vehicle Service Database
– Features:
Wiring diagrams [8]
Technical illustrations
### Mobile Applications
– Auto Repair Documents:
Electrical diagrams [5]
—
## Affordable Maintenance Advice
– Regular maintenance extends vehicle life
– Understand DTC meanings to avoid unnecessary repairs
– Select certified components when OEM prices prohibitive [7]
