## Common Diagnostic Trouble Codes

### P0420 Catalytic Converter Issue

– Frequent Reasons:

Faulty oxygen sensor [1]

– Common Solutions:

Repair exhaust system https://carautorepair.site/

### P0171 Fuel Mixture Imbalance

– Likely Problems:

Faulty MAF sensor

– Testing Procedure:

Smoke test intake [1][7]

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## Car Maintenance Terms

### ABS (Anti-Lock Brake System)

– Purpose: Enables safe braking [7]

### Engine Management Unit

– Responsibility: Controls ignition timing [7]

### Transmission System Parts

– Contains: Drive axles [7]

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## Mechanical Fixing Workflow

1. **Problem Identification**:

Scan DTCs

2. **Component Testing**:

Check voltage

3. **Defective Unit Swap**:

Follow torque specs

4. **Post-Repair Verification**:

Confirm warning light reset

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## Essential Tools

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

|—|—|—|

| Code Reader | Autel | Live data streaming |

| Hand Instruments | Multimeter | Component repair |

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## Service Information References

### Auto Repair Source

– Features:

Component locations [8]

OEM specifications

### Smartphone Tools

– Auto Repair Documents:

ECU pinouts [5]

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## Budget Repair Strategies

– Preventative service extends vehicle life

– Learn basic diagnostics to avoid unnecessary repairs

– Use aftermarket parts when budget constrained [7]