P2435
AIR System Air Flow/Pressure Sensor Circuit Bank 2
Secondary air injection (emissions)
Generic OBD-II
Low
What it means
P2435 means the ECM has seen an implausible or missing signal from the Bank 2 secondary-air injection flow/pressure sensor — the sensor that confirms the air pump is pushing air into the exhaust at cold start. It is an emissions fault, so the car drives normally, but the secondary-air monitor won't pass until the circuit is repaired.
Low
Can I keep driving? Safe to drive — the secondary air system only runs at cold start for emissions, so day-to-day driving is unaffected, but the fault should be fixed to pass emissions.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no change in how the vehicle drives
- Possible rough running only briefly at cold start
- May fail an emissions test
Common causes
Most likely first
- Faulty secondary-air airflow/pressure sensor on Bank 2Likely
- Open, short, or high resistance in the sensor circuitCommon
- Corroded or loose sensor connectorCommon
- Poor ground or reference voltage to the sensorLess often
- Air passage restricted or carbon-plugged, skewing the readingLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the fault is in the sensor circuit.
- Inspect the Bank 2 air flow/pressure sensor connector and wiring.
- Check the sensor's signal, reference, and ground circuits against spec.
- Inspect the secondary-air plumbing for carbon restriction.
- Replace the airflow/pressure sensor if faulty, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2435?+
Yes. The secondary air system only affects cold-start emissions, so the car drives normally, but fix it to pass an emissions test.
Can I just clear P2435?+
It will return the next time the secondary-air monitor runs unless the sensor or wiring is repaired.
Related codes
Often seen with P2435
Read & clear P2435 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