P2435 - Secondary Air Injection System Air Flow/Pressure Sensor Circuit Bank 2
The P2435 code indicates a problem with the secondary air injection (SAI) system's air flow/pressure sensor circuit on 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 malfunction (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.
1. Most Common Causes
- Faulty secondary air injection pressure sensor
- Wiring or connector issues (open, short, corrosion)
- Blocked or leaking secondary air injection system components
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible rough idle or reduced performance during cold start
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P2435 and check for related codes.
Step 2: Visually inspect the SAI pressure sensor and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and resistance per manufacturer specifications.
Step 4: Check for blockages in the SAI system (pump, hoses, valves) using a vacuum gauge or smoke test.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause increased emissions and could fail an emissions test. The vehicle is generally safe to drive, but the check engine light will remain on.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and sensor replacement, but costs can vary if additional repairs (e.g., wiring or SAI system components) are needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.