### P0420 Emissions Control Malfunction

– Frequent Reasons:

Worn catalytic converter [1]

– Common Solutions:

Diagnose fuel trim https://carautorepair.site/

### P0171 System Too Lean

– Possible Defects:

Fuel delivery problems

– Troubleshooting Process:

Smoke test intake [1][7]

## Car Maintenance Terms

### ABS (Anti-Lock Brake System)

– Purpose: Enables safe braking [7]

### Engine Management Unit

– Role: Monitors sensors [7]

### Drivetrain Components

– Includes: Drive axles [7]

## Service Procedure Stages

1. **Initial Diagnosis**:

Conduct road test

2. **System Verification**:

Test continuity

3. **Defective Unit Swap**:

Clear error codes

4. **Final Quality Check**:

Test drive vehicle

## Critical Instruments

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

|—|—|—|

| OBD-II Tool | Autel | Retrieve DTCs |

| Hand Instruments | Torque wrench | Component repair |

## Service Information References

### Mechanical Information System

– Capabilities:

TSB access [8]

Technical illustrations

### Digital Assistants

– Vehicle Service App:

Component testing guides [5]

## Cost-Saving Tips

– Preventative service prevents major failures

– Understand DTC meanings to prevent mechanic overselling

– Install quality alternatives when OEM prices prohibitive [7]

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