## Common Diagnostic Trouble Codes

### P0420 Catalyst System Efficiency Below Threshold

– Frequent Reasons:

Worn catalytic converter [1]

– Suggested Repairs:

Repair exhaust system https://carautorepair.site/

### P0171 System Too Lean

– Potential Issues:

Vacuum leaks

– Troubleshooting Process:

Smoke test intake [1][7]

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## Car Maintenance Terms

### Skid Prevention Technology

– Purpose: Enables safe braking [7]

### ECM/ECU (Engine Control Module)

– Role: Monitors sensors [7]

### Drivetrain Components

– Contains: Differential [7]

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## Repair Process Steps

1. **Symptom Assessment**:

Conduct road test

2. **Component Testing**:

Test continuity

3. **Parts Replacement**:

Use OEM parts

4. **System Validation**:

Test drive vehicle

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## Critical Instruments

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

|—|—|—|

| Diagnostic Scanner | BlueDriver | Live data streaming |

| Mechanical Tools | Smoke machine | Component repair |

—

## Technical Data Resources

### Auto Repair Source

– Capabilities:

TSB access [8]

Technical illustrations

### Smartphone Tools

– Auto Repair Documents:

ECU pinouts [5]

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## Affordable Maintenance Advice

– Preventative service prevents major failures

– Master code scanning to avoid unnecessary repairs

– Select certified components when OEM prices prohibitive [7]