## Common Diagnostic Trouble Codes

### P0420 Emissions Control Malfunction

– Common Causes:

Faulty oxygen sensor [1]

– Suggested Repairs:

Repair exhaust system https://carautorepair.site/

### P0171 Fuel Mixture Imbalance

– Potential Issues:

Fuel delivery problems

– Testing Procedure:

Check fuel pressure [1][7]

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## Vehicle Service Vocabulary

### Skid Prevention Technology

– Purpose: Enables safe braking [7]

### Engine Management Unit

– Role: Controls ignition timing [7]

### Powertrain Elements

– Contains: Drive axles [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. **Final Quality Check**:

Confirm warning light reset

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## Essential Tools

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

|—|—|—|

| Code Reader | Autel | Live data streaming |

| Hand Instruments | Smoke machine | Component repair |

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## Technical Data Resources

### Vehicle Service Database

– Features:

Component locations [8]

Factory repair procedures

### Mobile Applications

– Vehicle Service App:

ECU pinouts [5]

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## Cost-Saving Tips

– Preventative service extends vehicle life

– Understand DTC meanings to prevent mechanic overselling

– Install quality alternatives when budget constrained [7]