### P0420 Catalytic Converter Issue
– Frequent Reasons:
Worn catalytic converter [1]
– Common Solutions:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Vacuum leaks
– Testing Procedure:
Smoke test intake [1][7]
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## Auto Repair Terminology
### Electronic Braking System
– Function: Prevents wheel lockup [7]
### Vehicle Computer System
– Role: Monitors sensors [7]
### Transmission System Parts
– Contains: Differential [7]
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## Service Procedure Stages
1. **Initial Diagnosis**:
Scan DTCs
2. **Part Evaluation**:
Check voltage
3. **Parts Replacement**:
Follow torque specs
4. **Final Quality Check**:
Test drive vehicle
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Autel | Retrieve DTCs |
| Hand Instruments | Smoke machine | Component repair |
—
## Service Information References
### Vehicle Service Database
– Capabilities:
TSB access [8]
Factory repair procedures
### Mobile Applications
– Vehicle Service App:
Electrical diagrams [5]
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## Affordable Maintenance Advice
– Routine checkups prevents major failures
– Learn basic diagnostics to avoid unnecessary repairs
– Use aftermarket parts when OEM prices prohibitive [7]
