P2432
AIR System Air Flow/Pressure Sensor Circuit Low Bank 1
Secondary air injection
Generic OBD-II
Low
What it means
P2432 means the ECM sees a low-voltage signal (a short to ground or an open) from the secondary air injection air flow/pressure sensor on bank 1. This sensor confirms the system is actually pushing air into the exhaust at cold start to cut emissions. It's an emissions-monitoring fault rather than a running problem — the car drives normally but won't pass a smog test until the circuit or sensor is fixed.
Low
Can I keep driving? Yes — this is an emissions (cold-start) fault; the car drives normally but will fail an emissions test until fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no change in how the car drives
- May fail an emissions/smog test
- Possible rough running only during a cold start
Common causes
Most likely first
- Short-to-ground or open in the air flow/pressure sensor circuit (bank 1)Likely
- Corroded or loose connector at the sensorCommon
- Faulty secondary air injection air flow/pressure sensorCommon
- Moisture or carbon fouling the sensorLess often
- Faulty ECM/PCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Scan and confirm P2432 and check freeze-frame data.
- Inspect the sensor connector and wiring for a short to ground or an open.
- Check the sensor's reference voltage and signal against spec.
- Look for moisture or carbon contamination at the sensor and air passages.
- Replace the sensor if it fails, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2432?+
Yes. This sensor monitors the secondary air injection system, which only runs briefly at cold start. The car drives normally but will fail an emissions test until repaired.
Can I just clear P2432?+
It returns once the low-circuit condition is detected again. Fix the wiring or sensor rather than clearing it.
Related codes
Often seen with P2432
Read & clear P2432 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