## Common Diagnostic Trouble Codes

### P0420 Emissions Control Malfunction

– Frequent Reasons:

Faulty oxygen sensor [1]

– Recommended Fixes:

Repair exhaust system https://carautorepair.site/

### P0171 System Too Lean

– Possible Defects:

Fuel delivery problems

– Diagnostic Steps:

Inspect injectors [1][7]

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## Car Maintenance Terms

### ABS (Anti-Lock Brake System)

– Purpose: Maintains steering control [7]

### ECM/ECU (Engine Control Module)

– Responsibility: Controls ignition timing [7]

### Powertrain Elements

– Contains: Drive axles [7]

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## Service Procedure Stages

1. **Problem Identification**:

Conduct road test

2. **Component Testing**:

Test continuity

3. **Defective Unit Swap**:

Follow torque specs

4. **Final Quality Check**:

Ensure proper operation

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## Necessary Equipment

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

|—|—|—|

| Diagnostic Scanner | Innova | Retrieve DTCs |

| Mechanical Tools | Multimeter | Component repair |

—

## Repair Documentation Sources

### Vehicle Service Database

– Features:

TSB access [8]

Factory repair procedures

### Digital Assistants

– Auto Repair Documents:

Component testing guides [5]

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## Affordable Maintenance Advice

– Regular maintenance prevents major failures

– Learn basic diagnostics to prevent mechanic overselling

– Use aftermarket parts when OEM prices prohibitive [7]