P2433
AIR System Air Flow/Pressure Sensor Circuit High Bank 1
Secondary air injection
Generic OBD-II
Low
What it means
P2433 means the secondary air injection (SAI) system's air flow/pressure sensor on bank 1 is reading a high, out-of-range voltage — often a short to power or an open. That sensor confirms the SAI pump is pushing fresh air into the exhaust at cold start to help the catalyst light off. The fault is emissions-related; the engine runs normally and the main consequence is failing emissions.
Low
Can I keep driving? Yes — the car drives normally. This is an emissions circuit fault affecting the secondary-air monitor; it will fail emissions until repaired but won't affect power.
Common symptoms
What you'll notice
- Check-engine light on — often the only symptom
- May fail an emissions or smog test
- No noticeable change in power or driveability
- Occasionally a slightly rough cold start
Common causes
Most likely first
- Short-to-power or open in the SAI air flow/pressure sensor circuit (bank 1)Likely
- Faulty SAI air flow/pressure sensorCommon
- Corroded or damaged sensor connectorCommon
- Blocked or carbon-fouled SAI passage skewing the readingLess often
- Faulty PCM (rare)Less often
How to diagnose & fix
Work through it in order
- Inspect the SAI flow/pressure sensor connector and wiring for shorts-to-power or opens.
- Compare the sensor's live reading to expected values.
- Check the SAI plumbing for carbon blockage or leaks.
- Replace the sensor if it reads high with good wiring.
- Clear the code and confirm the SAI monitor runs.
FAQ
Quick answers
Is it safe to drive with P2433?+
Yes. It's an emissions-system sensor fault with no effect on power or safety, but repair it so the car passes emissions.
Can I just clear P2433?+
It returns the next time the SAI monitor runs unless the sensor or circuit fault is fixed.
Related codes
Often seen with P2433
Read & clear P2433 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