Diagnostic Trouble Code Index for March 2026
Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.Diagnostic Trouble Codes (DTC)
| Count | Trouble Code | Sample Definition | Manufacturers |
| 2 | P0171 | Fuel System Lean (Bank 1) | Chevrolet |
| 2 | P0174 | Fuel System Lean (Bank 2) | Chevrolet |
| 1 | P0172 | Fuel System Rich (Bank 1) | BMW |
| 1 | P0175 | Fuel System Rich (Bank 2) | BMW |
| 1 | P0301 | Cylinder 1 Misfire Detected | Toyota |
| 1 | P0302 | Cylinder 2 Misfire Detected | Toyota |
| 1 | U029D | Nox module a lost comm | Ram |
