## Typical Automotive DTCs

### P0420 Catalyst System Efficiency Below Threshold

– Frequent Reasons:

Worn catalytic converter [1]

– Common Solutions:

Replace catalytic converter https://carautorepair.site/

### P0171 System Too Lean

– Potential Issues:

Fuel delivery problems

– Testing Procedure:

Inspect injectors [1][7]

## Auto Repair Terminology

### Skid Prevention Technology

– Function: Enables safe braking [7]

### Engine Management Unit

– Responsibility: Manages fuel injection [7]

### Powertrain Elements

– Includes: Differential [7]

## Service Procedure Stages

1. **Problem Identification**:

Conduct road test

2. **System Verification**:

Check voltage

3. **Defective Unit Swap**:

Clear error codes

4. **Final Quality Check**:

Ensure proper operation

## Essential Tools

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

|—|—|—|

| OBD-II Tool | BlueDriver | Retrieve DTCs |

| Mechanical Tools | Smoke machine | Component repair |

## Technical Data Resources

### Vehicle Service Database

– Capabilities:

Wiring diagrams [8]

Technical illustrations

### Digital Assistants

– Auto Repair Documents:

Electrical diagrams [5]

## Budget Repair Strategies

– Routine checkups prevents major failures

– Understand DTC meanings to prevent mechanic overselling

– Use aftermarket parts when budget constrained [7]

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