## Common Diagnostic Trouble Codes

### P0420 Catalytic Converter Issue

– Common Causes:

Faulty oxygen sensor [1]

– Suggested Repairs:

Repair exhaust system https://carautorepair.site/

### P0171 System Too Lean

– Possible Defects:

Fuel delivery problems

– Diagnostic Steps:

Smoke test intake [1][7]

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## Car Maintenance Terms

### Electronic Braking System

– Function: Enables safe braking [7]

### Vehicle Computer System

– Role: Controls ignition timing [7]

### Powertrain Elements

– Includes: Differential [7]

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## Service Procedure Stages

1. **Symptom Assessment**:

Perform visual inspection

2. **Component Testing**:

Test continuity

3. **Component Installation**:

Follow torque specs

4. **System Validation**:

Test drive vehicle

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## Critical Instruments

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

|—|—|—|

| Code Reader | Autel | Retrieve DTCs |

| Physical Equipment | Torque wrench | Component repair |

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## Repair Documentation Sources

### Auto Repair Source

– Capabilities:

Wiring diagrams [8]

Technical illustrations

### Mobile Applications

– Vehicle Service App:

Electrical diagrams [5]

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## Budget Repair Strategies

– Routine checkups avoids costly repairs

– Understand DTC meanings to avoid unnecessary repairs

– Select certified components when OEM prices prohibitive [7]