## Common Diagnostic Trouble Codes

### P0420 Emissions Control Malfunction

– Typical Sources:

Worn catalytic converter [1]

– Common Solutions:

Repair exhaust system https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Likely Problems:

Vacuum leaks

– Testing Procedure:

Smoke test intake [1][7]

## Vehicle Service Vocabulary

### Skid Prevention Technology

– Purpose: Enables safe braking [7]

### ECM/ECU (Engine Control Module)

– Responsibility: Manages fuel injection [7]

### Drivetrain Components

– Includes: Transmission [7]

## Repair Process Steps

1. **Symptom Assessment**:

Scan DTCs

2. **Part Evaluation**:

Measure resistance

3. **Parts Replacement**:

Use OEM parts

4. **System Validation**:

Confirm warning light reset

## Necessary Equipment

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

|—|—|—|

| OBD-II Tool | Innova | Retrieve DTCs |

| Hand Instruments | Multimeter | Component repair |

## Repair Documentation Sources

### Mechanical Information System

– Capabilities:

Component locations [8]

OEM specifications

### Smartphone Tools

– Auto Repair Documents:

Electrical diagrams [5]

## Cost-Saving Tips

– Routine checkups extends vehicle life

– Understand DTC meanings to prevent mechanic overselling

– Select certified components when OEM prices prohibitive [7]

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