## Typical Automotive DTCs

### P0420 Catalyst System Efficiency Below Threshold

– Typical Sources:

Exhaust leaks [1]

– Common Solutions:

Diagnose fuel trim https://carautorepair.site/

### P0171 Fuel Mixture Imbalance

– Possible Defects:

Faulty MAF sensor

– Diagnostic Steps:

Inspect injectors [1][7]

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## Vehicle Service Vocabulary

### ABS (Anti-Lock Brake System)

– Purpose: Enables safe braking [7]

### Vehicle Computer System

– Responsibility: Monitors sensors [7]

### Transmission System Parts

– Includes: Drive axles [7]

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## Mechanical Fixing Workflow

1. **Problem Identification**:

Perform visual inspection

2. **Part Evaluation**:

Test continuity

3. **Parts Replacement**:

Clear error codes

4. **Final Quality Check**:

Ensure proper operation

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## Essential Tools

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

|—|—|—|

| Code Reader | BlueDriver | Retrieve DTCs |

| Mechanical Tools | Multimeter | Component repair |

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## Service Information References

### Vehicle Service Database

– Features:

Wiring diagrams [8]

Technical illustrations

### Digital Assistants

– Vehicle Service App:

Component testing guides [5]

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## Affordable Maintenance Advice

– Preventative service avoids costly repairs

– Understand DTC meanings to prevent mechanic overselling

– Select certified components when budget constrained [7]