### P0420 Catalyst System Efficiency Below Threshold
– Typical Sources:
Worn catalytic converter [1]
– Common Solutions:
Repair exhaust system https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Potential Issues:
Vacuum leaks
– Testing Procedure:
Inspect injectors [1][7]
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## Vehicle Service Vocabulary
### Skid Prevention Technology
– Purpose: Maintains steering control [7]
### Engine Management Unit
– Role: Monitors sensors [7]
### Drivetrain Components
– Contains: Transmission [7]
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## Mechanical Fixing Workflow
1. **Initial Diagnosis**:
Perform visual inspection
2. **System Verification**:
Measure resistance
3. **Defective Unit Swap**:
Follow torque specs
4. **Post-Repair Verification**:
Test drive vehicle
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Autel | Retrieve DTCs |
| Physical Equipment | Smoke machine | Component repair |
—
## Service Information References
### Mechanical Information System
– Capabilities:
TSB access [8]
Factory repair procedures
### Mobile Applications
– Auto Repair Documents:
ECU pinouts [5]
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## Affordable Maintenance Advice
– Preventative service avoids costly repairs
– Master code scanning to avoid unnecessary repairs
– Install quality alternatives when OEM prices prohibitive [7]