P2231 to P2256 and P2626 to P2631: wideband oxygen sensor circuits
The signal circuit of an oxygen sensor is shorted to its heater circuit, or one of the circuits of a wideband sensor (positive current, negative current, reference voltage or pumping current trim) is open, low or high.
SeverityModerateUsually not urgent today, but it can get worse if left.
Can you keep driving?Drive gently, check it soonWhat does P2231 mean?
Modern engines use a wideband oxygen sensor ahead of the catalyst, which measures the mixture precisely rather than only lean or rich. It has more wires than an older sensor: a pumping current, a reference cell and a calibration resistor, besides the heater. These codes say one of those circuits is wrong. A short between the signal and the heater usually happens inside the sensor or where the wires have melted together, so the sensor and its harness are the first suspects.
What causes P2231?
- A failed wideband oxygen sensor
- Sensor wires melted together near the exhaust
- Water inside the sensor connector
- A non-matching replacement sensor without the right calibration
- A damaged wire between the sensor and the engine computer
What to check first for P2231
- Inspect the sensor's harness along the exhaust for melted or chafed wires
- Check the sensor connector for water and corrosion
- Confirm the replacement sensor matches the original part number
- Have the sensor's circuits measured against the expected values
Can you drive with P2231?
Usually you can drive to a workshop. The engine may run richer and use more fuel without accurate mixture control, so do not leave it long.
Clear a code only after the fault is fixed. A code that comes back means the cause is still there, and a warning light left on can hide a second fault behind the first.
Codes on this page
32
- P2231O2 Sensor Signal Circuit Shorted to Heater CircuitBank 1 Sensor 1
- P2232O2 Sensor Signal Circuit Shorted to Heater CircuitBank 1 Sensor 2
- P2233O2 Sensor Signal Circuit Shorted to Heater CircuitBank 1 Sensor 3
- P2234O2 Sensor Signal Circuit Shorted to Heater CircuitBank 2 Sensor 1
- P2235O2 Sensor Signal Circuit Shorted to Heater CircuitBank 2 Sensor 2
- P2236O2 Sensor Signal Circuit Shorted to Heater CircuitBank 2 Sensor 3
- P2237O2 Sensor Positive Current Control Circuit/OpenBank 1 Sensor 1
- P2238O2 Sensor Positive Current Control Circuit LowBank 1 Sensor 1
- P2239O2 Sensor Positive Current Control Circuit HighBank 1 Sensor 1
- P2240O2 Sensor Positive Current Control Circuit/OpenBank 2 Sensor 1
- P2241O2 Sensor Positive Current Control Circuit LowBank 2 Sensor 1
- P2242O2 Sensor Positive Current Control Circuit HighBank 2 Sensor 1
- P2243O2 Sensor Reference Voltage Circuit/OpenBank 1 Sensor 1
- P2244O2 Sensor Reference Voltage PerformanceBank 1 Sensor 1
- P2245O2 Sensor Reference Voltage Circuit LowBank 1 Sensor 1
- P2246O2 Sensor Reference Voltage Circuit HighBank 1 Sensor 1
- P2247O2 Sensor Reference Voltage Circuit/OpenBank 2 Sensor 1
- P2248O2 Sensor Reference Voltage PerformanceBank 2 Sensor 1
- P2249O2 Sensor Reference Voltage Circuit LowBank 2 Sensor 1
- P2250O2 Sensor Reference Voltage Circuit HighBank 2 Sensor 1
- P2251O2 Sensor Negative Current Control Circuit/OpenBank 1 Sensor 1
- P2252O2 Sensor Negative Current Control Circuit LowBank 1 Sensor 1
- P2253O2 Sensor Negative Current Control Circuit HighBank 1 Sensor 1
- P2254O2 Sensor Negative Current Control Circuit/OpenBank 2 Sensor 1
- P2255O2 Sensor Negative Current Control Circuit LowBank 2 Sensor 1
- P2256O2 Sensor Negative Current Control Circuit HighBank 2 Sensor 1
- P2626O2 Sensor Pumping Current Trim Circuit/OpenBank 1 Sensor 1
- P2627O2 Sensor Pumping Current Trim Circuit LowBank 1 Sensor 1
- P2628O2 Sensor Pumping Current Trim Circuit HighBank 1 Sensor 1
- P2629O2 Sensor Pumping Current Trim Circuit/OpenBank 2 Sensor 1
- P2630O2 Sensor Pumping Current Trim Circuit LowBank 2 Sensor 1
- P2631O2 Sensor Pumping Current Trim Circuit HighBank 2 Sensor 1
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
