## Frequent Vehicle Error Codes

### P0420 Catalyst System Efficiency Below Threshold

– Typical Sources:

Worn catalytic converter [1]

– Recommended Fixes:

Repair exhaust system https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Potential Issues:

Fuel delivery problems

– Testing Procedure:

Smoke test intake [1][7]

## Car Maintenance Terms

### ABS (Anti-Lock Brake System)

– Function: Prevents wheel lockup [7]

### Engine Management Unit

– Responsibility: Manages fuel injection [7]

### Transmission System Parts

– Includes: Drive axles [7]

## Service Procedure Stages

1. **Initial Diagnosis**:

Scan DTCs

2. **Component Testing**:

Test continuity

3. **Parts Replacement**:

Clear error codes

4. **Final Quality Check**:

Test drive vehicle

## Necessary Equipment

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

|—|—|—|

| Diagnostic Scanner | Innova | Retrieve DTCs |

| Physical Equipment | Smoke machine | Component repair |

## Repair Documentation Sources

### Auto Repair Source

– Capabilities:

TSB access [8]

OEM specifications

### Digital Assistants

– Vehicle Service App:

Component testing guides [5]

## Cost-Saving Tips

– Preventative service extends vehicle life

– Learn basic diagnostics to prevent mechanic overselling

– Install quality alternatives when budget constrained [7]

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