### P0420 Catalytic Converter Issue
– Frequent Reasons:
Exhaust leaks [1]
– Recommended Fixes:
Diagnose fuel trim https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Faulty MAF sensor
– Diagnostic Steps:
Smoke test intake [1][7]
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## Car Maintenance Terms
### Skid Prevention Technology
– Function: Prevents wheel lockup [7]
### ECM/ECU (Engine Control Module)
– Responsibility: Manages fuel injection [7]
### Powertrain Elements
– Includes: Drive axles [7]
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## Mechanical Fixing Workflow
1. **Problem Identification**:
Scan DTCs
2. **Part Evaluation**:
Check voltage
3. **Parts Replacement**:
Use OEM parts
4. **Post-Repair Verification**:
Test drive vehicle
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Autel | Live data streaming |
| Mechanical Tools | Torque wrench | Electrical testing |
—
## Repair Documentation Sources
### Vehicle Service Database
– Capabilities:
TSB access [8]
Factory repair procedures
### Digital Assistants
– Auto Repair Documents:
Component testing guides [5]
—
## Budget Repair Strategies
– Routine checkups extends vehicle life
– Learn basic diagnostics to prevent mechanic overselling
– Use aftermarket parts when OEM prices prohibitive [7]