## Frequent Vehicle Error Codes

### P0420 Catalytic Converter Issue

– Frequent Reasons:

Worn catalytic converter [1]

– Recommended Fixes:

Diagnose fuel trim https://carautorepair.site/

### P0171 System Too Lean

– Potential Issues:

Fuel delivery problems

– Testing Procedure:

Smoke test intake [1][7]

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## Auto Repair Terminology

### Skid Prevention Technology

– Purpose: Enables safe braking [7]

### Engine Management Unit

– 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. **System Verification**:

Test continuity

3. **Defective Unit Swap**:

Follow torque specs

4. **System Validation**:

Ensure proper operation

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## Critical Instruments

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

|—|—|—|

| OBD-II Tool | Autel | Live data streaming |

| Mechanical Tools | Smoke machine | Electrical testing |

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## Repair Documentation Sources

### Auto Repair Source

– Features:

Wiring diagrams [8]

OEM specifications

### Digital Assistants

– Vehicle Service App:

Electrical diagrams [5]

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## Affordable Maintenance Advice

– Preventative service extends vehicle life

– Master code scanning to prevent mechanic overselling

– Use aftermarket parts when OEM prices prohibitive [7]