### P0420 Emissions Control Malfunction
– Typical Sources:
Worn catalytic converter [1]
– Common Solutions:
Diagnose fuel trim https://carautorepair.site/
### P0171 System Too Lean
– Likely Problems:
Vacuum leaks
– Diagnostic Steps:
Inspect injectors [1][7]
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## Auto Repair Terminology
### Skid Prevention Technology
– Purpose: Prevents wheel lockup [7]
### Engine Management Unit
– Responsibility: Monitors sensors [7]
### Drivetrain Components
– Contains: Transmission [7]
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## Repair Process Steps
1. **Symptom Assessment**:
Perform visual inspection
2. **Part Evaluation**:
Test continuity
3. **Component Installation**:
Clear error codes
4. **Final Quality Check**:
Test drive vehicle
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Autel | Retrieve DTCs |
| Mechanical Tools | Multimeter | Electrical testing |
—
## Service Information References
### Mechanical Information System
– Capabilities:
TSB access [8]
OEM specifications
### Mobile Applications
– Auto Repair Documents:
ECU pinouts [5]
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## Cost-Saving Tips
– Preventative service avoids costly repairs
– Learn basic diagnostics to prevent mechanic overselling
– Select certified components when budget constrained [7]