### P0420 Emissions Control Malfunction
– Typical Sources:
Faulty oxygen sensor [1]
– Recommended Fixes:
Repair exhaust system https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Possible Defects:
Vacuum leaks
– Testing Procedure:
Smoke test intake [1][7]
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## Vehicle Service Vocabulary
### Skid Prevention Technology
– Function: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Role: Manages fuel injection [7]
### Powertrain Elements
– Includes: Transmission [7]
—
## Mechanical Fixing Workflow
1. **Initial Diagnosis**:
Conduct road test
2. **Component Testing**:
Check voltage
3. **Defective Unit Swap**:
Use OEM parts
4. **Final Quality Check**:
Confirm warning light reset
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | BlueDriver | Retrieve DTCs |
| Mechanical Tools | Smoke machine | Electrical testing |
—
## Service Information References
### Vehicle Service Database
– Features:
Wiring diagrams [8]
Technical illustrations
### Mobile Applications
– Auto Repair Documents:
ECU pinouts [5]
—
## Budget Repair Strategies
– Preventative service avoids costly repairs
– Learn basic diagnostics to avoid unnecessary repairs
– Install quality alternatives when OEM prices prohibitive [7]
