### P0420 Catalyst System Efficiency Below Threshold
– Common Causes:
Faulty oxygen sensor [1]
– Common Solutions:
Replace catalytic converter https://carautorepair.site/
### P0171 System Too Lean
– Potential Issues:
Vacuum leaks
– Diagnostic Steps:
Inspect injectors [1][7]
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## Auto Repair Terminology
### Skid Prevention Technology
– Purpose: Maintains steering control [7]
### Vehicle Computer System
– Responsibility: Manages fuel injection [7]
### Powertrain Elements
– Contains: Drive axles [7]
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## Repair Process Steps
1. **Problem Identification**:
Perform visual inspection
2. **System Verification**:
Measure resistance
3. **Component Installation**:
Use OEM parts
4. **Final Quality Check**:
Confirm warning light reset
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## Necessary Equipment
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Autel | Live data streaming |
| Hand Instruments | Torque wrench | Electrical testing |
—
## Technical Data Resources
### Vehicle Service Database
– Capabilities:
Component locations [8]
OEM specifications
### Mobile Applications
– Vehicle Service App:
ECU pinouts [5]
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## Affordable Maintenance Advice
– Routine checkups avoids costly repairs
– Learn basic diagnostics to avoid unnecessary repairs
– Use aftermarket parts when OEM prices prohibitive [7]