## Typical Automotive DTCs

### P0420 Catalytic Converter Issue

– Typical Sources:

Exhaust leaks [1]

– Suggested Repairs:

Replace catalytic converter https://carautorepair.site/

### P0171 System Too Lean

– Likely Problems:

Vacuum leaks

– Troubleshooting Process:

Inspect injectors [1][7]

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## Auto Repair Terminology

### ABS (Anti-Lock Brake System)

– Purpose: Prevents wheel lockup [7]

### ECM/ECU (Engine Control Module)

– Role: Controls ignition timing [7]

### Transmission System Parts

– Includes: Differential [7]

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## Repair Process Steps

1. **Symptom Assessment**:

Perform visual inspection

2. **Component Testing**:

Measure resistance

3. **Defective Unit Swap**:

Clear error codes

4. **System Validation**:

Confirm warning light reset

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## Critical Instruments

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

|—|—|—|

| Code Reader | BlueDriver | Retrieve DTCs |

| Mechanical Tools | Multimeter | Component repair |

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## Technical Data Resources

### Vehicle Service Database

– Capabilities:

Wiring diagrams [8]

Factory repair procedures

### Smartphone Tools

– Auto Repair Documents:

ECU pinouts [5]

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## Cost-Saving Tips

– Regular maintenance extends vehicle life

– Understand DTC meanings to avoid unnecessary repairs

– Select certified components when OEM prices prohibitive [7]