### P0420 Emissions Control Malfunction
– Typical Sources:
Worn catalytic converter [1]
– Common Solutions:
Repair exhaust system https://carautorepair.site/
### P0171 Air-Fuel Ratio Error
– Potential Issues:
Fuel delivery problems
– Diagnostic Steps:
Smoke test intake [1][7]
—
## Vehicle Service Vocabulary
### Electronic Braking System
– Purpose: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Role: Monitors sensors [7]
### Transmission System Parts
– Includes: Transmission [7]
—
## Mechanical Fixing Workflow
1. **Symptom Assessment**:
Perform visual inspection
2. **System Verification**:
Check voltage
3. **Component Installation**:
Follow torque specs
4. **Final Quality Check**:
Ensure proper operation
—
## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Diagnostic Scanner | Innova | Retrieve DTCs |
| Physical Equipment | Multimeter | Electrical testing |
—
## Repair Documentation Sources
### Auto Repair Source
– Capabilities:
TSB access [8]
Factory repair procedures
### Mobile Applications
– Auto Repair Documents:
ECU pinouts [5]
—
## Cost-Saving Tips
– Preventative service extends vehicle life
– Understand DTC meanings to avoid unnecessary repairs
– Use aftermarket parts when OEM prices prohibitive [7]
