### P0420 Catalyst System Efficiency Below Threshold
– Typical Sources:
Faulty oxygen sensor [1]
– Common Solutions:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Potential Issues:
Fuel delivery problems
– Testing Procedure:
Smoke test intake [1][7]
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## Auto Repair Terminology
### Electronic Braking System
– Purpose: Maintains steering control [7]
### Vehicle Computer System
– Responsibility: Manages fuel injection [7]
### Drivetrain Components
– Contains: Transmission [7]
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## Repair Process Steps
1. **Symptom Assessment**:
Conduct road test
2. **Part Evaluation**:
Test continuity
3. **Parts Replacement**:
Follow torque specs
4. **Final Quality Check**:
Ensure proper operation
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | BlueDriver | Live data streaming |
| Physical Equipment | Smoke machine | Electrical testing |
—
## Technical Data Resources
### Auto Repair Source
– Capabilities:
TSB access [8]
Factory repair procedures
### Smartphone Tools
– Vehicle Service App:
Component testing guides [5]
—
## Budget Repair Strategies
– Preventative service extends vehicle life
– Learn basic diagnostics to avoid unnecessary repairs
– Select certified components when budget constrained [7]
