### P0420 Emissions Control Malfunction
– Frequent Reasons:
Faulty oxygen sensor [1]
– Common Solutions:
Diagnose fuel trim https://carautorepair.site/
### P0171 System Too Lean
– Possible Defects:
Faulty MAF sensor
– Testing Procedure:
Check fuel pressure [1][7]
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## Car Maintenance Terms
### Skid Prevention Technology
– Purpose: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Manages fuel injection [7]
### Drivetrain Components
– Includes: Differential [7]
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## Service Procedure Stages
1. **Problem Identification**:
Conduct road test
2. **Component Testing**:
Check voltage
3. **Component Installation**:
Follow torque specs
4. **Final Quality Check**:
Ensure proper operation
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | BlueDriver | Retrieve DTCs |
| Mechanical Tools | Multimeter | Component repair |
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## Service Information References
### Vehicle Service Database
– Capabilities:
Component locations [8]
Technical illustrations
### Mobile Applications
– Auto Repair Documents:
ECU pinouts [5]
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## Budget Repair Strategies
– Routine checkups extends vehicle life
– Learn basic diagnostics to avoid unnecessary repairs
– Select certified components when budget constrained [7]