2019 Acura P0131: What It Means & Is It Safe to Drive?
P0131 on the 2019 Acura: O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
What this code means
The upstream oxygen sensor on Bank 1 is reporting a voltage signal below the expected range. This can indicate a faulty sensor, a lean condition, or an exhaust leak near the sensor.
Common causes on the 2019 Acura
- Failed upstream oxygen sensor
- Exhaust leak before the sensor
- Lean fuel condition (vacuum leak, weak fuel pressure)
- Damaged sensor wiring or ground
Symptoms
- Check Engine Light
- Poor fuel economy
- Rough idle in some cases
- Failed emissions test
Typical fixes
- Replace upstream oxygen sensor (Bank 1, Sensor 1)
- Locate and fix exhaust leaks
- Smoke test for vacuum leaks
- Check fuel pressure
Repair cost range
For a 2019 Acura, repairs for P0131 typically fall between $100 and $350, depending on the root cause and labor rates in your area.
Known issues on Acura
Acura P0131 upstream O2 sensor Bank 1 degradation on J35 and K24 engines typically means a worn sensor past 100k miles. OEM Denso sensors are recommended. Inspect for a small exhaust manifold leak before replacing—early J-series exhaust manifold studs can break and cause a small leak near the sensor.
Most commonly affected models