## Typical Automotive DTCs

### P0420 Catalytic Converter Issue

– Frequent Reasons:

Faulty oxygen sensor [1]

– Recommended Fixes:

Diagnose fuel trim https://carautorepair.site/

### P0171 System Too Lean

– Likely Problems:

Faulty MAF sensor

– Troubleshooting Process:

Check fuel pressure [1][7]

## Car Maintenance Terms

### ABS (Anti-Lock Brake System)

– Function: Maintains steering control [7]

### Vehicle Computer System

– Responsibility: Manages fuel injection [7]

### Drivetrain Components

– Includes: Transmission [7]

## Repair Process Steps

1. **Initial Diagnosis**:

Conduct road test

2. **Component Testing**:

Check voltage

3. **Parts Replacement**:

Clear error codes

4. **Post-Repair Verification**:

Confirm warning light reset

## Critical Instruments

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

|—|—|—|

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

| Mechanical Tools | Smoke machine | Electrical testing |

## Repair Documentation Sources

### Auto Repair Source

– Features:

Wiring diagrams [8]

Factory repair procedures

### Mobile Applications

– Auto Repair Documents:

Electrical diagrams [5]

## Cost-Saving Tips

– Preventative service prevents major failures

– Understand DTC meanings to prevent mechanic overselling

– Install quality alternatives when OEM prices prohibitive [7]

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