## Frequent Vehicle Error Codes

### P0420 Catalyst System Efficiency Below Threshold

– Frequent Reasons:

Exhaust leaks [1]

– Suggested Repairs:

Diagnose fuel trim https://carautorepair.site/

### P0171 Fuel Mixture Imbalance

– Possible Defects:

Faulty MAF sensor

– Troubleshooting Process:

Smoke test intake [1][7]

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## Vehicle Service Vocabulary

### Electronic Braking System

– Purpose: Prevents wheel lockup [7]

### Engine Management Unit

– Role: Manages fuel injection [7]

### Powertrain Elements

– Contains: Differential [7]

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## Service Procedure Stages

1. **Initial Diagnosis**:

Scan DTCs

2. **Component Testing**:

Test continuity

3. **Defective Unit Swap**:

Use OEM parts

4. **Final Quality Check**:

Test drive vehicle

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## Critical Instruments

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

|—|—|—|

| Diagnostic Scanner | Innova | Live data streaming |

| Mechanical Tools | Smoke machine | Component repair |

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## Technical Data Resources

### Auto Repair Source

– Features:

TSB access [8]

Technical illustrations

### Smartphone Tools

– Vehicle Service App:

Component testing guides [5]

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## Budget Repair Strategies

– Regular maintenance prevents major failures

– Understand DTC meanings to prevent mechanic overselling

– Select certified components when budget constrained [7]