P2249: The lambda sensor reference voltage (bank 2, sensor 1) is below normal
The lambda sensor reference voltage (bank 2, sensor 1) is below normal. It may be the sensor itself, its connector or the wiring.
| Code | P2249 |
|---|---|
| System | Engine and transmission |
| Group | P22xx, NOx sensors, oxygen sensors and emissions |
| Type | Generic: it means the same on every make |
How to read and clear P2249 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2249 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2245 The lambda sensor reference voltage (bank 1, sensor 1) is below normal
- P2246 The lambda sensor reference voltage (bank 1, sensor 1) is above normal
- P2247 The lambda sensor reference voltage (bank 2
- P2248 The reference voltage of the front lambda sensor on the second bank is not
- P224A The NOx sensor heater resistor (bank 1, sensor 1) is not working properly
- P224B The NOx sensor heater resistor (bank 1, sensor 2) is not working properly
- P224C The alternative fuel tank lock valve A control has a broken or disconnected wire
- P224D The alternative fuel tank lock valve A control circuit has got stuck
- P2200 NOx sensor circuit fault (bank 1)
- P2201 NOx sensor circuit range or performance problem (bank 1)
- P2227 Barometric pressure sensor A range or performance problem
- P2228 Barometric pressure sensor A circuit low
What does code P2249 mean?
The lambda sensor reference voltage (bank 2, sensor 1) is below normal. It may be the sensor itself, its connector or the wiring.
How do you clear P2249?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2249 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
