### P0420 Catalyst System Efficiency Below Threshold
– Frequent Reasons:
Exhaust leaks [1]
– Recommended Fixes:
Replace catalytic converter https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Potential Issues:
Faulty MAF sensor
– Diagnostic Steps:
Check fuel pressure [1][7]
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## Vehicle Service Vocabulary
### ABS (Anti-Lock Brake System)
– Function: Enables safe braking [7]
### Engine Management Unit
– Role: Controls ignition timing [7]
### Drivetrain Components
– Contains: Drive axles [7]
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## Repair Process Steps
1. **Symptom Assessment**:
Perform visual inspection
2. **System Verification**:
Measure resistance
3. **Component Installation**:
Use OEM parts
4. **Post-Repair Verification**:
Test drive vehicle
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | BlueDriver | Retrieve DTCs |
| Mechanical Tools | Smoke machine | Component repair |
—
## Technical Data Resources
### Vehicle Service Database
– Capabilities:
TSB access [8]
Factory repair procedures
### Mobile Applications
– Auto Repair Documents:
ECU pinouts [5]
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## Affordable Maintenance Advice
– Routine checkups avoids costly repairs
– Master code scanning to prevent mechanic overselling
– Use aftermarket parts when budget constrained [7]