### P0420 Emissions Control Malfunction

– Frequent Reasons:

Worn catalytic converter [1]

– Common Solutions:

Replace catalytic converter https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Possible Defects:

Fuel delivery problems

– Testing Procedure:

Check fuel pressure [1][7]

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## Car Maintenance Terms

### ABS (Anti-Lock Brake System)

– Purpose: Prevents wheel lockup [7]

### ECM/ECU (Engine Control Module)

– Responsibility: Manages fuel injection [7]

### Transmission System Parts

– Includes: Transmission [7]

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## Service Procedure Stages

1. **Problem Identification**:

Perform visual inspection

2. **Component Testing**:

Measure resistance

3. **Component Installation**:

Use OEM parts

4. **System Validation**:

Test drive vehicle

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## Necessary Equipment

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

|—|—|—|

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

| Physical Equipment | Multimeter | Component repair |

—

## Service Information References

### Vehicle Service Database

– Capabilities:

Component locations [8]

Factory repair procedures

### Digital Assistants

– Auto Repair Documents:

Component testing guides [5]

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## Cost-Saving Tips

– Preventative service prevents major failures

– Understand DTC meanings to prevent mechanic overselling

– Select certified components when budget constrained [7]