## Typical Automotive DTCs

### P0420 Catalytic Converter Issue

– Common Causes:

Worn catalytic converter [1]

– Recommended Fixes:

Diagnose fuel trim https://carautorepair.site/

### P0171 System Too Lean

– Possible Defects:

Fuel delivery problems

– Troubleshooting Process:

Check fuel pressure [1][7]

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## Vehicle Service Vocabulary

### ABS (Anti-Lock Brake System)

– Function: Enables safe braking [7]

### ECM/ECU (Engine Control Module)

– Responsibility: Monitors sensors [7]

### Drivetrain Components

– Contains: Transmission [7]

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## Service Procedure Stages

1. **Initial Diagnosis**:

Scan DTCs

2. **System Verification**:

Test continuity

3. **Defective Unit Swap**:

Use OEM parts

4. **Final Quality Check**:

Test drive vehicle

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## Necessary Equipment

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

|—|—|—|

| Code Reader | Innova | Live data streaming |

| Hand Instruments | Smoke machine | Component repair |

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## Repair Documentation Sources

### Mechanical Information System

– Features:

TSB access [8]

OEM specifications

### Smartphone Tools

– Auto Repair Documents:

Component testing guides [5]

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## Budget Repair Strategies

– Regular maintenance extends vehicle life

– Master code scanning to prevent mechanic overselling

– Install quality alternatives when OEM prices prohibitive [7]