### P0420 Catalytic Converter Issue
– Common Causes:
Faulty oxygen sensor [1]
– Common Solutions:
Diagnose fuel trim https://carautorepair.site/
### P0171 System Too Lean
– Possible Defects:
Faulty MAF sensor
– Troubleshooting Process:
Inspect injectors [1][7]
—
## Vehicle Service Vocabulary
### Skid Prevention Technology
– Function: Maintains steering control [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Manages fuel injection [7]
### Drivetrain Components
– Includes: Drive axles [7]
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## Service Procedure Stages
1. **Problem Identification**:
Conduct road test
2. **Part Evaluation**:
Check voltage
3. **Component Installation**:
Clear error codes
4. **Final Quality Check**:
Confirm warning light reset
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | BlueDriver | Live data streaming |
| Hand Instruments | Torque wrench | Component repair |
—
## Service Information References
### Vehicle Service Database
– Features:
Wiring diagrams [8]
OEM specifications
### Mobile Applications
– Vehicle Service App:
ECU pinouts [5]
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## Cost-Saving Tips
– Routine checkups extends vehicle life
– Learn basic diagnostics to prevent mechanic overselling
– Select certified components when OEM prices prohibitive [7]
