### P0420 Emissions Control Malfunction
– Common Causes:
Faulty oxygen sensor [1]
– Recommended Fixes:
Replace catalytic converter https://carautorepair.site/
### P0171 System Too Lean
– Possible Defects:
Faulty MAF sensor
– Testing Procedure:
Check fuel pressure [1][7]
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## Auto Repair Terminology
### Electronic Braking System
– Function: Maintains steering control [7]
### Vehicle Computer System
– Role: Monitors sensors [7]
### Transmission System Parts
– Includes: Transmission [7]
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## Service Procedure Stages
1. **Problem Identification**:
Conduct road test
2. **Part Evaluation**:
Test continuity
3. **Defective Unit Swap**:
Clear error codes
4. **Post-Repair Verification**:
Confirm warning light reset
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | BlueDriver | Live data streaming |
| Physical Equipment | Smoke machine | Component repair |
—
## Service Information References
### Vehicle Service Database
– Capabilities:
Component locations [8]
OEM specifications
### Smartphone Tools
– Vehicle Service App:
ECU pinouts [5]
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## Affordable Maintenance Advice
– Routine checkups prevents major failures
– Master code scanning to prevent mechanic overselling
– Use aftermarket parts when OEM prices prohibitive [7]
