System Too Lean (Bank 1)
| Code | P0171 |
| Description | System Too Lean (Bank 1) |
| Possible Causes | The fuel system is running too lean on bank 1. Common causes: vacuum leak, weak fuel pump, clogged fuel filter, faulty MAF sensor. |
| System | Fuel and Air Metering |
System Too Lean (Bank 1). This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the fuel and air metering.
P = Powertrain code
0 = Generic (SAE standard)