### P0420 Emissions Control Malfunction
– Frequent Reasons:
Exhaust leaks [1]
– Suggested Repairs:
Diagnose fuel trim https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Faulty MAF sensor
– Troubleshooting Process:
Smoke test intake [1][7]
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## Car Maintenance Terms
### Skid Prevention Technology
– Purpose: Prevents wheel lockup [7]
### Vehicle Computer System
– Role: Manages fuel injection [7]
### Drivetrain Components
– Includes: Drive axles [7]
—
## Mechanical Fixing Workflow
1. **Symptom Assessment**:
Perform visual inspection
2. **System Verification**:
Measure resistance
3. **Component Installation**:
Use OEM parts
4. **Post-Repair Verification**:
Confirm warning light reset
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Autel | Live data streaming |
| Physical Equipment | Smoke machine | Electrical testing |
—
## Repair Documentation Sources
### Mechanical Information System
– Features:
TSB access [8]
Factory repair procedures
### Mobile Applications
– Vehicle Service App:
Component testing guides [5]
—
## Budget Repair Strategies
– Preventative service avoids costly repairs
– Master code scanning to avoid unnecessary repairs
– Select certified components when budget constrained [7]
