## Common Diagnostic Trouble Codes

### P0420 Emissions Control Malfunction

– Typical Sources:

Exhaust leaks [1]

– Common Solutions:

Replace catalytic converter https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Likely Problems:

Vacuum leaks

– Diagnostic Steps:

Check fuel pressure [1][7]

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## Auto Repair Terminology

### Skid Prevention Technology

– Purpose: Enables safe braking [7]

### Engine Management Unit

– Responsibility: Monitors sensors [7]

### Transmission System Parts

– Includes: Transmission [7]

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## Service Procedure Stages

1. **Initial Diagnosis**:

Perform visual inspection

2. **System Verification**:

Test continuity

3. **Defective Unit Swap**:

Use OEM parts

4. **Final Quality Check**:

Confirm warning light reset

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## Essential Tools

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

|—|—|—|

| Diagnostic Scanner | BlueDriver | Live data streaming |

| Mechanical Tools | Torque wrench | Component repair |

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## Service Information References

### Vehicle Service Database

– Capabilities:

Wiring diagrams [8]

Factory repair procedures

### Smartphone Tools

– Vehicle Service App:

Electrical diagrams [5]

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## Affordable Maintenance Advice

– Preventative service extends vehicle life

– Learn basic diagnostics to avoid unnecessary repairs

– Install quality alternatives when budget constrained [7]