### P0420 Catalytic Converter Issue

– Frequent Reasons:

Faulty oxygen sensor [1]

– Recommended Fixes:

Repair exhaust system https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Potential Issues:

Faulty MAF sensor

– Testing Procedure:

Smoke test intake [1][7]

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## Car Maintenance Terms

### Skid Prevention Technology

– Function: Maintains steering control [7]

### Vehicle Computer System

– Role: Monitors sensors [7]

### Drivetrain Components

– Includes: Differential [7]

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## Service Procedure Stages

1. **Problem Identification**:

Conduct road test

2. **Component Testing**:

Test continuity

3. **Component Installation**:

Follow torque specs

4. **System Validation**:

Confirm warning light reset

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## Essential Tools

| **Tool Type** | **Examples** | **Purpose** |

|—|—|—|

| Code Reader | BlueDriver | Retrieve DTCs |

| Physical Equipment | Torque wrench | Component repair |

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## Service Information References

### Auto Repair Source

– Features:

TSB access [8]

Technical illustrations

### Mobile Applications

– Auto Repair Documents:

Component testing guides [5]

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## Cost-Saving Tips

– Regular maintenance prevents major failures

– Master code scanning to avoid unnecessary repairs

– Install quality alternatives when budget constrained [7]