## Frequent Vehicle Error Codes

### P0420 Emissions Control Malfunction

– Common Causes:

Worn catalytic converter [1]

– Suggested Repairs:

Diagnose fuel trim https://carautorepair.site/

### P0171 System Too Lean

– Possible Defects:

Fuel delivery problems

– Testing Procedure:

Inspect injectors [1][7]

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## Auto Repair Terminology

### ABS (Anti-Lock Brake System)

– Purpose: Maintains steering control [7]

### Engine Management Unit

– Responsibility: Monitors sensors [7]

### Drivetrain Components

– Contains: Transmission [7]

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## Mechanical Fixing Workflow

1. **Symptom Assessment**:

Scan DTCs

2. **System Verification**:

Measure resistance

3. **Component Installation**:

Follow torque specs

4. **System Validation**:

Ensure proper operation

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## Necessary Equipment

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

|—|—|—|

| Diagnostic Scanner | Autel | Live data streaming |

| Mechanical Tools | Torque wrench | Component repair |

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## Technical Data Resources

### Vehicle Service Database

– Features:

Wiring diagrams [8]

Factory repair procedures

### Mobile Applications

– Vehicle Service App:

ECU pinouts [5]

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## Budget Repair Strategies

– Preventative service prevents major failures

– Learn basic diagnostics to avoid unnecessary repairs

– Install quality alternatives when OEM prices prohibitive [7]