### P0420 Catalytic Converter Issue
– Common Causes:
Worn catalytic converter [1]
– Suggested Repairs:
Diagnose fuel trim https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Faulty MAF sensor
– Testing Procedure:
Inspect injectors [1][7]
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## Car Maintenance Terms
### ABS (Anti-Lock Brake System)
– Function: Maintains steering control [7]
### Vehicle Computer System
– Role: Manages fuel injection [7]
### Powertrain Elements
– Includes: Drive axles [7]
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## Mechanical Fixing Workflow
1. **Initial Diagnosis**:
Conduct road test
2. **Part Evaluation**:
Measure resistance
3. **Parts Replacement**:
Follow torque specs
4. **Final Quality Check**:
Confirm warning light reset
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Innova | Live data streaming |
| Physical Equipment | Smoke machine | Component repair |
—
## Service Information References
### Vehicle Service Database
– Capabilities:
Component locations [8]
Technical illustrations
### Smartphone Tools
– Auto Repair Documents:
ECU pinouts [5]
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## Cost-Saving Tips
– Preventative service prevents major failures
– Understand DTC meanings to avoid unnecessary repairs
– Install quality alternatives when budget constrained [7]