## Frequent Vehicle Error Codes

### P0420 Catalyst System Efficiency Below Threshold

– Typical Sources:

Worn catalytic converter [1]

– Common Solutions:

Repair exhaust system https://carautorepair.site/

### P0171 Air-Fuel Ratio Error

– Possible Defects:

Vacuum leaks

– Diagnostic Steps:

Inspect injectors [1][7]

## Auto Repair Terminology

### Skid Prevention Technology

– Function: Enables safe braking [7]

### ECM/ECU (Engine Control Module)

– Role: Controls ignition timing [7]

### Powertrain Elements

– Contains: Drive axles [7]

## Mechanical Fixing Workflow

1. **Symptom Assessment**:

Scan DTCs

2. **Component Testing**:

Check voltage

3. **Parts Replacement**:

Clear error codes

4. **Final Quality Check**:

Test drive vehicle

## Critical Instruments

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

|—|—|—|

| Diagnostic Scanner | Autel | Live data streaming |

| Mechanical Tools | Smoke machine | Component repair |

## Service Information References

### Auto Repair Source

– Features:

Component locations [8]

Factory repair procedures

### Digital Assistants

– Vehicle Service App:

ECU pinouts [5]

## Affordable Maintenance Advice

– Routine checkups avoids costly repairs

– Master code scanning to prevent mechanic overselling

– Install quality alternatives when OEM prices prohibitive [7]

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