## Typical Automotive DTCs

### P0420 Emissions Control Malfunction

– Typical Sources:

Worn catalytic converter [1]

– Suggested Repairs:

Diagnose fuel trim https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Possible Defects:

Fuel delivery problems

– Troubleshooting Process:

Smoke test intake [1][7]

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## Car Maintenance Terms

### Electronic Braking System

– Function: Maintains steering control [7]

### Vehicle Computer System

– Responsibility: Manages fuel injection [7]

### Powertrain Elements

– Contains: Transmission [7]

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## Repair Process Steps

1. **Initial Diagnosis**:

Conduct road test

2. **Part Evaluation**:

Measure resistance

3. **Defective Unit Swap**:

Follow torque specs

4. **Post-Repair Verification**:

Confirm warning light reset

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## Necessary Equipment

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

|—|—|—|

| OBD-II Tool | Autel | Retrieve DTCs |

| Physical Equipment | Torque wrench | Electrical testing |

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## Service Information References

### Vehicle Service Database

– Capabilities:

Wiring diagrams [8]

Technical illustrations

### Smartphone Tools

– Vehicle Service App:

Component testing guides [5]

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## Affordable Maintenance Advice

– Regular maintenance avoids costly repairs

– Master code scanning to avoid unnecessary repairs

– Use aftermarket parts when OEM prices prohibitive [7]