### P0420 Emissions Control Malfunction
– Common Causes:
Worn catalytic converter [1]
– Common Solutions:
Diagnose fuel trim https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Fuel delivery problems
– Troubleshooting Process:
Smoke test intake [1][7]
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## Vehicle Service Vocabulary
### Electronic Braking System
– Purpose: Enables safe braking [7]
### Vehicle Computer System
– Role: Manages fuel injection [7]
### Drivetrain Components
– Includes: Differential [7]
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## Service Procedure Stages
1. **Symptom Assessment**:
Perform visual inspection
2. **System Verification**:
Check voltage
3. **Defective Unit Swap**:
Use OEM parts
4. **System Validation**:
Confirm warning light reset
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | BlueDriver | Retrieve DTCs |
| Mechanical Tools | Multimeter | Component repair |
—
## Technical Data Resources
### Mechanical Information System
– Capabilities:
TSB access [8]
OEM specifications
### Smartphone Tools
– Vehicle Service App:
Component testing guides [5]
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## Budget Repair Strategies
– Routine checkups extends vehicle life
– Learn basic diagnostics to prevent mechanic overselling
– Select certified components when budget constrained [7]
