### P0420 Emissions Control Malfunction
– Typical Sources:
Exhaust leaks [1]
– Recommended Fixes:
Diagnose fuel trim https://carautorepair.site/
### P0171 System Too Lean
– Possible Defects:
Fuel delivery problems
– Troubleshooting Process:
Smoke test intake [1][7]
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## Vehicle Service Vocabulary
### Electronic Braking System
– Function: Enables safe braking [7]
### ECM/ECU (Engine Control Module)
– Role: Controls ignition timing [7]
### Powertrain Elements
– Includes: Transmission [7]
—
## Repair Process Steps
1. **Problem Identification**:
Perform visual inspection
2. **System Verification**:
Test continuity
3. **Component Installation**:
Clear error codes
4. **System Validation**:
Test drive vehicle
—
## Critical Instruments
| **Tool Type** | **Examples** | **Purpose** |
|—|—|—|
| Code Reader | Innova | Live data streaming |
| Physical Equipment | Torque wrench | Electrical testing |
—
## Technical Data Resources
### Auto Repair Source
– Features:
TSB access [8]
Technical illustrations
### Mobile Applications
– Vehicle Service App:
ECU pinouts [5]
—
## Budget Repair Strategies
– Routine checkups extends vehicle life
– Learn basic diagnostics to avoid unnecessary repairs
– Install quality alternatives when OEM prices prohibitive [7]
