### P0420 Emissions Control Malfunction
– Typical Sources:
Worn catalytic converter [1]
– Common Solutions:
Diagnose fuel trim https://carautorepair.site/
### P0171 System Too Lean
– Likely Problems:
Faulty MAF sensor
– Troubleshooting Process:
Inspect injectors [1][7]
—
## Auto Repair Terminology
### ABS (Anti-Lock Brake System)
– Function: Prevents wheel lockup [7]
### Engine Management Unit
– Role: Monitors sensors [7]
### Transmission System Parts
– Includes: Drive axles [7]
—
## Service Procedure Stages
1. **Initial Diagnosis**:
Conduct road test
2. **System Verification**:
Check voltage
3. **Component Installation**:
Use OEM parts
4. **System Validation**:
Confirm warning light reset
—
## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| OBD-II Tool | Innova | Retrieve DTCs |
| Physical Equipment | Torque wrench | Component repair |
—
## Repair Documentation Sources
### Auto Repair Source
– Features:
Wiring diagrams [8]
Technical illustrations
### Smartphone Tools
– Auto Repair Documents:
ECU pinouts [5]
—
## Cost-Saving Tips
– Preventative service prevents major failures
– Understand DTC meanings to avoid unnecessary repairs
– Select certified components when budget constrained [7]