### P0420 Catalyst System Efficiency Below Threshold
– Typical Sources:
Exhaust leaks [1]
– Common Solutions:
Diagnose fuel trim https://carautorepair.site/
### P0171 Fuel Mixture Imbalance
– Potential Issues:
Vacuum leaks
– Testing Procedure:
Inspect injectors [1][7]
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## Auto Repair Terminology
### ABS (Anti-Lock Brake System)
– Purpose: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Role: Monitors sensors [7]
### Transmission System Parts
– Contains: Drive axles [7]
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## Repair Process Steps
1. **Symptom Assessment**:
Perform visual inspection
2. **Part Evaluation**:
Test continuity
3. **Parts Replacement**:
Use OEM parts
4. **Final Quality Check**:
Test drive vehicle
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | BlueDriver | Live data streaming |
| Mechanical Tools | Multimeter | Component repair |
—
## Technical Data Resources
### Vehicle Service Database
– Capabilities:
Wiring diagrams [8]
OEM specifications
### Mobile Applications
– Vehicle Service App:
Component testing guides [5]
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## Budget Repair Strategies
– Preventative service extends vehicle life
– Master code scanning to prevent mechanic overselling
– Install quality alternatives when budget constrained [7]