## Frequent Vehicle Error Codes

### P0420 Emissions Control Malfunction

– Typical Sources:

Faulty oxygen sensor [1]

– Common Solutions:

Diagnose fuel trim https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Potential Issues:

Faulty MAF sensor

– Troubleshooting Process:

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]

### Drivetrain Components

– Includes: Drive axles [7]

## Repair Process Steps

1. **Symptom Assessment**:

Perform visual inspection

2. **Component Testing**:

Check voltage

3. **Defective Unit Swap**:

Follow torque specs

4. **Final Quality Check**:

Ensure proper operation

## Essential Tools

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

|—|—|—|

| Diagnostic Scanner | Innova | Retrieve DTCs |

| Mechanical Tools | Multimeter | Electrical testing |

## Technical Data Resources

### Auto Repair Source

– Features:

Wiring diagrams [8]

OEM specifications

### Digital Assistants

– Vehicle Service App:

Component testing guides [5]

## Affordable Maintenance Advice

– Regular maintenance extends vehicle life

– Master code scanning to prevent mechanic overselling

– Select certified components when OEM prices prohibitive [7]

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