## Typical Automotive DTCs

### P0420 Catalyst System Efficiency Below Threshold

– Common Causes:

Exhaust leaks [1]

– Recommended Fixes:

Replace catalytic converter https://carautorepair.site/

### P0171 Fuel Mixture Imbalance

– Likely Problems:

Vacuum leaks

– Testing Procedure:

Inspect injectors [1][7]

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## Car Maintenance Terms

### Skid Prevention Technology

– Function: Maintains steering control [7]

### ECM/ECU (Engine Control Module)

– Responsibility: Controls ignition timing [7]

### Powertrain Elements

– Includes: Drive axles [7]

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## Service Procedure Stages

1. **Initial Diagnosis**:

Scan DTCs

2. **System Verification**:

Measure resistance

3. **Parts Replacement**:

Follow torque specs

4. **System Validation**:

Test drive vehicle

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## Essential Tools

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

|—|—|—|

| Diagnostic Scanner | BlueDriver | Retrieve DTCs |

| Hand Instruments | Multimeter | Component repair |

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## Repair Documentation Sources

### Vehicle Service Database

– Capabilities:

TSB access [8]

Technical illustrations

### Smartphone Tools

– Auto Repair Documents:

Component testing guides [5]

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## Cost-Saving Tips

– Preventative service avoids costly repairs

– Learn basic diagnostics to avoid unnecessary repairs

– Select certified components when budget constrained [7]