### P0420 Emissions Control Malfunction
– Frequent Reasons:
Faulty oxygen sensor [1]
– Suggested Repairs:
Diagnose fuel trim https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Likely Problems:
Vacuum leaks
– Diagnostic Steps:
Smoke test intake [1][7]
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## Vehicle Service Vocabulary
### Skid Prevention Technology
– Function: Prevents wheel lockup [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Monitors sensors [7]
### Powertrain Elements
– Contains: Drive axles [7]
—
## Mechanical Fixing Workflow
1. **Initial Diagnosis**:
Conduct road test
2. **Component Testing**:
Test continuity
3. **Component Installation**:
Use OEM parts
4. **Post-Repair Verification**:
Ensure proper operation
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Autel | Retrieve DTCs |
| Physical Equipment | Multimeter | Electrical testing |
—
## Technical Data Resources
### Vehicle Service Database
– Features:
TSB access [8]
Technical illustrations
### Mobile Applications
– Vehicle Service App:
Component testing guides [5]
—
## Cost-Saving Tips
– Routine checkups extends vehicle life
– Understand DTC meanings to avoid unnecessary repairs
– Install quality alternatives when OEM prices prohibitive [7]