## Common Diagnostic Trouble Codes

### P0420 Catalyst System Efficiency Below Threshold

– Frequent Reasons:

Worn catalytic converter [1]

– Recommended Fixes:

Diagnose fuel trim https://carautorepair.site/

### P0171 Fuel Mixture Imbalance

– Likely Problems:

Faulty MAF sensor

– Troubleshooting Process:

Check fuel pressure [1][7]

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## Vehicle Service Vocabulary

### Skid Prevention Technology

– Function: Prevents wheel lockup [7]

### ECM/ECU (Engine Control Module)

– Responsibility: Controls ignition timing [7]

### Drivetrain Components

– Contains: Drive axles [7]

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## Service Procedure Stages

1. **Symptom Assessment**:

Conduct road test

2. **Part Evaluation**:

Test continuity

3. **Parts Replacement**:

Use OEM parts

4. **System Validation**:

Test drive vehicle

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## Necessary Equipment

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

|—|—|—|

| OBD-II Tool | Innova | Retrieve DTCs |

| Mechanical Tools | Torque wrench | Electrical testing |

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## Technical Data Resources

### Vehicle Service Database

– Capabilities:

Wiring diagrams [8]

Technical illustrations

### Mobile Applications

– Auto Repair Documents:

ECU pinouts [5]

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## Cost-Saving Tips

– Preventative service extends vehicle life

– Learn basic diagnostics to prevent mechanic overselling

– Select certified components when budget constrained [7]