### P0420 Catalytic Converter Issue

– Common Causes:

Faulty oxygen sensor [1]

– Common Solutions:

Replace catalytic converter https://carautorepair.site/

### P0171 Fuel Mixture Imbalance

– Likely Problems:

Faulty MAF sensor

– Testing Procedure:

Smoke test intake [1][7]

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## Vehicle Service Vocabulary

### ABS (Anti-Lock Brake System)

– Purpose: Prevents wheel lockup [7]

### Vehicle Computer System

– Role: Manages fuel injection [7]

### Transmission System Parts

– Contains: Drive axles [7]

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## Service Procedure Stages

1. **Problem Identification**:

Scan DTCs

2. **System Verification**:

Test continuity

3. **Defective Unit Swap**:

Use OEM parts

4. **Post-Repair Verification**:

Test drive vehicle

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## Critical Instruments

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

|—|—|—|

| Diagnostic Scanner | Innova | Retrieve DTCs |

| Mechanical Tools | Torque wrench | Component repair |

—

## Technical Data Resources

### Mechanical Information System

– Features:

TSB access [8]

Factory repair procedures

### Smartphone Tools

– Vehicle Service App:

Electrical diagrams [5]

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## Budget Repair Strategies

– Regular maintenance avoids costly repairs

– Understand DTC meanings to prevent mechanic overselling

– Select certified components when budget constrained [7]