O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
The engine computer is seeing a very low signal from the front oxygen sensor on bank 1. This usually means the engine may be running too lean, or the sensor, wiring, or connector has a problem. It can cause rough running, higher fuel use, and emissions issues.
You may be able to drive short distances, but the engine can run poorly and fuel economy may suffer. Do not ignore it, because a lean condition can damage the engine or catalytic converter if the problem is severe.
P0131 indicates the powertrain control module has detected a persistently low voltage signal from the upstream oxygen sensor on Bank 1, Sensor 1. This sensor is used for fuel control, so a low reading can be caused by a true lean exhaust condition, an exhaust leak, vacuum leak, fuel delivery problem, or a faulty sensor/circuit. The code sets when the signal stays below the expected range for too long under the right operating conditions.
It means the upstream oxygen sensor on Bank 1 is showing a voltage that is too low, or the engine is actually running too lean.
Yes. A failing front oxygen sensor is a common cause, but vacuum leaks and fuel problems are also common.
It can. The engine computer may not control fuel mixture correctly, which can cause rough idle, hesitation, and poor fuel economy.
Yes. P0131 refers to the upstream oxygen sensor on Bank 1, also called Sensor 1.
You can clear it, but it will usually come back if the underlying problem is still there.