### P0420 Catalytic Converter Issue

– Frequent Reasons:

Exhaust leaks [1]

– Recommended Fixes:

Diagnose fuel trim https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Potential Issues:

Vacuum leaks

– Troubleshooting Process:

Inspect injectors [1][7]

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## Vehicle Service Vocabulary

### Electronic Braking System

– Function: Maintains steering control [7]

### Engine Management Unit

– Role: Monitors sensors [7]

### Powertrain Elements

– Includes: Differential [7]

—

## Service Procedure Stages

1. **Symptom Assessment**:

Perform visual inspection

2. **System Verification**:

Test continuity

3. **Component Installation**:

Use OEM parts

4. **Final Quality Check**:

Confirm warning light reset

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## Necessary Equipment

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

|—|—|—|

| Diagnostic Scanner | Autel | Live data streaming |

| Mechanical Tools | Multimeter | Electrical testing |

—

## Technical Data Resources

### Mechanical Information System

– Features:

TSB access [8]

Technical illustrations

### Smartphone Tools

– Vehicle Service App:

ECU pinouts [5]

—

## Affordable Maintenance Advice

– Regular maintenance avoids costly repairs

– Learn basic diagnostics to avoid unnecessary repairs

– Select certified components when OEM prices prohibitive [7]