### P0420 Emissions Control Malfunction
– Typical Sources:
Worn catalytic converter [1]
– Recommended Fixes:
Repair exhaust system https://carautorepair.site/
### P0171 System Too Lean
– Potential Issues:
Faulty MAF sensor
– Diagnostic Steps:
Smoke test intake [1][7]
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## Vehicle Service Vocabulary
### ABS (Anti-Lock Brake System)
– Function: Maintains steering control [7]
### ECM/ECU (Engine Control Module)
– Role: Monitors sensors [7]
### Powertrain Elements
– Includes: Drive axles [7]
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## Service Procedure Stages
1. **Initial Diagnosis**:
Conduct road test
2. **System Verification**:
Measure resistance
3. **Defective Unit Swap**:
Follow torque specs
4. **System Validation**:
Ensure proper operation
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## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Autel | Live data streaming |
| Hand Instruments | Torque wrench | Electrical testing |
—
## Technical Data Resources
### Auto Repair Source
– Features:
Component locations [8]
OEM specifications
### Smartphone Tools
– Vehicle Service App:
Component testing guides [5]
—
## Cost-Saving Tips
– Regular maintenance extends vehicle life
– Understand DTC meanings to prevent mechanic overselling
– Use aftermarket parts when budget constrained [7]