Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 2
P2436 indicates the secondary air injection system air flow or pressure sensor on Bank 2 is reporting out-of-range values or poor performance. This system injects fresh air into the exhaust to reduce emissions during cold start and warm-up, and the sensor monitors proper airflow to the system.
What You Might Notice
- Check engine light illuminated
- Engine stalling at idle
- Difficulty starting the engine
- Secondary air injection system making hissing or whistling noise
- Rough idle or poor engine performance during cold start
Most Common Causes
- 1
Defective air pressure sensor
The secondary air injection pressure sensor on Bank 2 may be failing or providing inaccurate readings to the PCM, causing the system to operate outside normal parameters.
- 2
Defective secondary air injection pump
The air pump that supplies air to the secondary injection system may be worn, damaged, or failing to deliver adequate airflow to Bank 2.
- 3
Faulty one-way check valve
The check valve in the secondary air injection line on Bank 2 may be stuck, damaged, or leaking, preventing proper air flow control.
- 4
Wiring or connector issues
Corroded, loose, or damaged wiring and connectors in the secondary air injection circuit can disrupt sensor signals and system operation.
How to Diagnose It
- 1
Check Defective air pressure sensor — The secondary air injection pressure sensor on Bank 2 may be failing or providing inaccurate readings to the PCM, causing the system to operate outside normal parameters.
- 2
Check Defective secondary air injection pump — The air pump that supplies air to the secondary injection system may be worn, damaged, or failing to deliver adequate airflow to Bank 2.
- 3
Check Faulty one-way check valve — The check valve in the secondary air injection line on Bank 2 may be stuck, damaged, or leaking, preventing proper air flow control.
- 4
Check Wiring or connector issues — Corroded, loose, or damaged wiring and connectors in the secondary air injection circuit can disrupt sensor signals and system operation.
How to Fix It
- 1
Replace air pressure sensor
Locate the secondary air injection air flow/pressure sensor on Bank 2 and replace it with a new OEM or quality aftermarket sensor. Clear the code and test drive to verify.
- 2
Inspect and repair wiring and connectors
Inspect all wiring and connectors in the secondary air injection circuit on Bank 2 for corrosion, damage, or loose connections. Clean, repair, or replace as needed.
- 3
Replace secondary air injection pump
If the pump is defective or not delivering adequate airflow, remove and replace the secondary air injection pump assembly. Verify proper airflow to Bank 2 after installation.
- 4
Replace check valve
Remove and inspect the one-way check valve in the Bank 2 air injection line. Replace if stuck, damaged, or leaking to restore proper system pressure and airflow.
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