### P0420 Catalyst System Efficiency Below Threshold

– Frequent Reasons:

Worn catalytic converter [1]

– Suggested Repairs:

Repair exhaust system https://carautorepair.site/

### P0171 System Too Lean

– Potential Issues:

Fuel delivery problems

– Testing Procedure:

Inspect injectors [1][7]

## Vehicle Service Vocabulary

### Electronic Braking System

– Function: Prevents wheel lockup [7]

### Engine Management Unit

– Role: Manages fuel injection [7]

### Transmission System Parts

– Contains: Transmission [7]

## Service Procedure Stages

1. **Symptom Assessment**:

Perform visual inspection

2. **Component Testing**:

Check voltage

3. **Parts Replacement**:

Clear error codes

4. **System Validation**:

Confirm warning light reset

## Essential Tools

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

|—|—|—|

| OBD-II Tool | Autel | Retrieve DTCs |

| Mechanical Tools | Torque wrench | Component repair |

## Repair Documentation Sources

### Vehicle Service Database

– Features:

TSB access [8]

Technical illustrations

### Smartphone Tools

– Auto Repair Documents:

Component testing guides [5]

## Cost-Saving Tips

– Preventative service prevents major failures

– Master code scanning to prevent mechanic overselling

– Use aftermarket parts when budget constrained [7]

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