### P0420 Emissions Control Malfunction
– Common Causes:
Faulty oxygen sensor [1]
– Recommended Fixes:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Potential Issues:
Vacuum leaks
– Troubleshooting Process:
Smoke test intake [1][7]
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## Auto Repair Terminology
### ABS (Anti-Lock Brake System)
– Function: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Monitors sensors [7]
### Transmission System Parts
– Includes: Transmission [7]
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## Service Procedure Stages
1. **Symptom Assessment**:
Scan DTCs
2. **Component Testing**:
Measure resistance
3. **Parts Replacement**:
Use OEM parts
4. **Final Quality Check**:
Ensure proper operation
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Innova | Live data streaming |
| Hand Instruments | Smoke machine | Electrical testing |
—
## Repair Documentation Sources
### Vehicle Service Database
– Capabilities:
Component locations [8]
Technical illustrations
### Mobile Applications
– Auto Repair Documents:
Component testing guides [5]
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## Affordable Maintenance Advice
– Routine checkups avoids costly repairs
– Understand DTC meanings to avoid unnecessary repairs
– Install quality alternatives when budget constrained [7]