P2436
AIR System Air Flow/Pressure Sensor Circuit Range/Performance Bank 2
Secondary air injection / emissions
Generic OBD-II
Low
What it means
P2436 means the airflow/pressure sensor for the secondary air injection system on bank 2 is giving a reading that's out of the expected range. This system pumps fresh air into the exhaust briefly at cold start to reduce emissions, so the fault doesn't affect normal driving. Causes include a faulty sensor, wiring problems, or clogged 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 that won't affect normal driving.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no change in how the car drives
- May fail an emissions/readiness test
- Possible rough running only during cold start-up
Common causes
Most likely first
- Faulty secondary-air flow/pressure sensor on bank 2Likely
- Wiring or connector fault at the sensorCommon
- Restricted or carbon-clogged secondary-air passagesCommon
- Stuck or leaking air check valveLess often
- Weak air pump or air-switching valve giving an out-of-range readingLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for other secondary-air (AIR) codes.
- Inspect the bank 2 air flow/pressure sensor connector and wiring for damage or corrosion.
- Compare the sensor's live reading with a scan tool while the air pump runs at cold start.
- Check the secondary-air plumbing and check valve for carbon blockage or leaks.
- Replace the sensor if it reads out of range with good wiring and airflow. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2436?+
Yes. The secondary air system only operates for a short time after a cold start to help the catalyst warm up, so this fault doesn't affect normal driving. Fix it to clear the light and pass emissions.
Can I just clear P2436?+
You can, but it returns the next time the secondary-air monitor runs unless the sensor, wiring, or airflow problem is fixed.
Related codes
Often seen with P2436
Read & clear P2436 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