P2435 - Secondary Air Injection System Air Flow/Pressure Sensor Circuit Bank 2
The P2435 code indicates a malfunction in the secondary air injection (SAI) system's air flow/pressure sensor circuit for Bank 2. The SAI system reduces cold-start emissions by injecting fresh air into the exhaust. The sensor monitors air flow or pressure; when the PCM detects a circuit fault (e.g., open, short, or out-of-range signal), it sets this code. Common causes include a faulty sensor, wiring issues, or a blocked SAI system.
01. Most Common Causes
- Faulty secondary air injection pressure sensor
- Open or shorted wiring in the sensor circuit
- Blocked or leaking secondary air injection system
- Failed secondary air injection pump or relay
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or hesitation on cold start
- Failed emissions test
- Possible reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the SAI system components and wiring for damage or blockage.
Step 3: Test the sensor circuit with a multimeter for proper voltage and continuity.
Step 4: Check the SAI pump operation and air flow to the exhaust manifold.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause rough idle and increased emissions. Prolonged driving could damage the catalytic converter.
How much does it cost to fix?▼
Repair costs range from $150 to $400, depending on the cause. Sensor replacement is typically $100-$200, plus labor.