## Typical Automotive DTCs

### P0420 Catalytic Converter Issue

– Common Causes:

Worn catalytic converter [1]

– Common Solutions:

Repair exhaust system https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Possible Defects:

Fuel delivery problems

– Diagnostic Steps:

Inspect injectors [1][7]

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## Auto Repair Terminology

### ABS (Anti-Lock Brake System)

– Function: Maintains steering control [7]

### Engine Management Unit

– Role: Controls ignition timing [7]

### Transmission System Parts

– Includes: Differential [7]

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## Service Procedure Stages

1. **Symptom Assessment**:

Conduct road test

2. **System Verification**:

Check voltage

3. **Component Installation**:

Follow torque specs

4. **System Validation**:

Test drive vehicle

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## Necessary Equipment

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

|—|—|—|

| Diagnostic Scanner | Autel | Live data streaming |

| Hand Instruments | Torque wrench | Component repair |

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## Service Information References

### Vehicle Service Database

– Capabilities:

Component locations [8]

Technical illustrations

### Smartphone Tools

– Auto Repair Documents:

ECU pinouts [5]

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## Affordable Maintenance Advice

– Regular maintenance prevents major failures

– Master code scanning to prevent mechanic overselling

– Use aftermarket parts when OEM prices prohibitive [7]