P2437
AIR System Air Flow/Pressure Sensor Circuit Low Bank 2
Secondary air injection (emissions)
Generic OBD-II
Low
What it means
P2437 means the secondary air injection system's air flow/pressure sensor on bank 2 is reading a low signal. Because this system only runs briefly at cold start to reduce emissions, the fault rarely affects drivability. Common causes are a shorted sensor circuit, a bad connector, a failed sensor, or carbon-restricted air passages.
Low
Can I keep driving? Safe to drive — the secondary air system only runs briefly at cold start, so this is an emissions fault with little to no effect on how the car runs.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no change in drivability
- Possible slightly rough idle right after a cold start
- May fail an emissions/readiness test
Common causes
Most likely first
- Faulty secondary-air flow/pressure sensor on bank 2Likely
- Sensor circuit shorted to ground or open (low signal)Common
- Corroded or loose sensor connectorCommon
- Air passage restricted or plugged with carbon, skewing the readingLess often
- Wiring fault between the sensor and the ECMLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the low-signal condition.
- Inspect the bank 2 air flow/pressure sensor connector and wiring for shorts or opens.
- Check the sensor's reference voltage and ground.
- Look for carbon-clogged secondary-air passages affecting the sensor.
- Replace the sensor if the circuit is good, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2437?+
Yes. The secondary air system only assists cold-start emissions, so the car drives normally, but it should be fixed to pass emissions.
Can I just clear P2437?+
It returns during the next cold-start monitor if the sensor or wiring is still faulty. Repair the circuit first.
Related codes
Often seen with P2437
Read & clear P2437 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX