### P0420 Catalytic Converter Issue
– Typical Sources:
Worn catalytic converter [1]
– Common Solutions:
Diagnose fuel trim https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Likely Problems:
Fuel delivery problems
– Diagnostic Steps:
Check fuel pressure [1][7]
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## Car Maintenance Terms
### ABS (Anti-Lock Brake System)
– Purpose: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Role: Monitors sensors [7]
### Transmission System Parts
– Includes: Drive axles [7]
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## Service Procedure Stages
1. **Initial Diagnosis**:
Perform visual inspection
2. **Component Testing**:
Measure resistance
3. **Defective Unit Swap**:
Use OEM parts
4. **System Validation**:
Ensure proper operation
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## Essential Tools
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | BlueDriver | Live data streaming |
| Hand Instruments | Torque wrench | Electrical testing |
—
## Service Information References
### Vehicle Service Database
– Capabilities:
Component locations [8]
OEM specifications
### Digital Assistants
– Vehicle Service App:
Component testing guides [5]
—
## Budget Repair Strategies
– Preventative service extends vehicle life
– Master code scanning to avoid unnecessary repairs
– Use aftermarket parts when budget constrained [7]
