## Frequent Vehicle Error Codes

### P0420 Catalytic Converter Issue

– Common Causes:

Worn catalytic converter [1]

– Common Solutions:

Repair exhaust system https://carautorepair.site/

### P0171 System Too Lean

– Possible Defects:

Fuel delivery problems

– Testing Procedure:

Check fuel pressure [1][7]

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## Auto Repair Terminology

### ABS (Anti-Lock Brake System)

– Purpose: Maintains steering control [7]

### Engine Management Unit

– Responsibility: Controls ignition timing [7]

### Powertrain Elements

– Includes: Transmission [7]

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## Repair Process Steps

1. **Symptom Assessment**:

Perform visual inspection

2. **System Verification**:

Measure resistance

3. **Defective Unit Swap**:

Use OEM parts

4. **Post-Repair Verification**:

Test drive vehicle

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## Necessary Equipment

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

|—|—|—|

| Code Reader | Autel | Live data streaming |

| Physical Equipment | Smoke machine | Component repair |

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## Technical Data Resources

### Mechanical Information System

– Features:

Wiring diagrams [8]

Factory repair procedures

### Smartphone Tools

– Vehicle Service App:

Component testing guides [5]

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## Cost-Saving Tips

– Preventative service prevents major failures

– Learn basic diagnostics to prevent mechanic overselling

– Use aftermarket parts when OEM prices prohibitive [7]