## Typical Automotive DTCs

### P0420 Emissions Control Malfunction

– Frequent Reasons:

Exhaust leaks [1]

– Common Solutions:

Repair exhaust system https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Possible Defects:

Vacuum leaks

– Testing Procedure:

Smoke test intake [1][7]

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## Auto Repair Terminology

### Skid Prevention Technology

– Function: Maintains steering control [7]

### Engine Management Unit

– Role: Monitors sensors [7]

### Powertrain Elements

– Includes: Transmission [7]

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## Mechanical Fixing Workflow

1. **Problem Identification**:

Perform visual inspection

2. **Part Evaluation**:

Measure resistance

3. **Component Installation**:

Clear error codes

4. **Post-Repair Verification**:

Confirm warning light reset

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## Critical Instruments

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

|—|—|—|

| Code Reader | Autel | Retrieve DTCs |

| Physical Equipment | Multimeter | Electrical testing |

—

## Technical Data Resources

### Mechanical Information System

– Features:

TSB access [8]

Technical illustrations

### Mobile Applications

– Auto Repair Documents:

Component testing guides [5]

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## Affordable Maintenance Advice

– Preventative service prevents major failures

– Master code scanning to avoid unnecessary repairs

– Install quality alternatives when OEM prices prohibitive [7]