### P0420 Catalytic Converter Issue

– Common Causes:

Worn catalytic converter [1]

– Suggested Repairs:

Repair exhaust system https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Likely Problems:

Faulty MAF sensor

– Troubleshooting Process:

Check fuel pressure [1][7]

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## Auto Repair Terminology

### ABS (Anti-Lock Brake System)

– Function: Prevents wheel lockup [7]

### Engine Management Unit

– Responsibility: Monitors sensors [7]

### Powertrain Elements

– Includes: Differential [7]

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## Repair Process Steps

1. **Problem Identification**:

Perform visual inspection

2. **Component Testing**:

Measure resistance

3. **Parts Replacement**:

Clear error codes

4. **Final Quality Check**:

Confirm warning light reset

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## Critical Instruments

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

|—|—|—|

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

| Mechanical Tools | Torque wrench | Component repair |

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## Technical Data Resources

### Vehicle Service Database

– Features:

TSB access [8]

Technical illustrations

### Digital Assistants

– Vehicle Service App:

Electrical diagrams [5]

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## Budget Repair Strategies

– Preventative service prevents major failures

– Learn basic diagnostics to avoid unnecessary repairs

– Use aftermarket parts when budget constrained [7]