### P0420 Catalyst System Efficiency Below Threshold
– Common Causes:
Exhaust leaks [1]
– Suggested Repairs:
Replace catalytic converter https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Potential Issues:
Fuel delivery problems
– Testing Procedure:
Inspect injectors [1][7]
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## Car Maintenance Terms
### Skid Prevention Technology
– Function: Maintains steering control [7]
### Engine Management Unit
– Role: Manages fuel injection [7]
### Powertrain Elements
– Includes: Drive axles [7]
—
## Service Procedure Stages
1. **Initial Diagnosis**:
Perform visual inspection
2. **System Verification**:
Measure resistance
3. **Defective Unit Swap**:
Clear error codes
4. **System Validation**:
Test drive vehicle
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | BlueDriver | Retrieve DTCs |
| Physical Equipment | Torque wrench | Component repair |
—
## Repair Documentation Sources
### Auto Repair Source
– Features:
Component locations [8]
OEM specifications
### Digital Assistants
– Vehicle Service App:
ECU pinouts [5]
—
## Budget Repair Strategies
– Preventative service prevents major failures
– Learn basic diagnostics to avoid unnecessary repairs
– Install quality alternatives when OEM prices prohibitive [7]