OBD-II Generic Error Code P2437: How to Fix It

Q: What does P2437 mean on my OBD2 scanner?

P2437 means the engine control module has detected that the secondary air injection pressure sensor on Bank 2 is producing a signal lower than the minimum expected threshold. Bank 2 is the side of the engine that does not contain cylinder number 1. This code is most common during cold starts when the secondary air injection system is supposed to be actively pumping air into the exhaust.

Q: Can I drive with a P2437 code?

Yes, you can typically drive short distances with a P2437 code since it does not usually cause drivability problems or immediate mechanical damage. However, your vehicle will likely fail an emissions test with this code active, and leaving the underlying issue unresolved can eventually cause premature catalytic converter wear since the emissions system is not functioning properly. It is best to diagnose and repair the fault as soon as convenient.

Q: How much does it cost to fix a P2437 code?

Repair costs vary widely depending on the root cause. Replacing the secondary air injection pressure sensor alone typically costs $50–$200 in parts, plus $75–$150 in labor at a shop. Replacing the air injection pump is more expensive, ranging from $150–$400 for the part and $100–$250 in labor depending on accessibility. Hoses and check valves are usually inexpensive at $20–$80 each. Always get an accurate diagnosis before authorizing major repairs.

Q: What is the difference between P2437 and P2432?

P2432 refers to the secondary air injection pressure sensor on Bank 1 reading low, while P2437 refers to the same type of fault on Bank 2. Bank 1 contains cylinder number 1, and Bank 2 is the opposite side on V-type and horizontally-opposed engines. If both codes appear together, it often points to a shared component failure such as the air pump, a common wiring issue, or the ECM itself rather than individual sensor failures.

Q: Will replacing the O2 sensor fix a P2437 code?

No. P2437 is specific to the secondary air injection pressure sensor on Bank 2, which is a different component from the oxygen (O2) sensor. While both sensors relate to the exhaust system, they serve entirely different functions. The oxygen sensor measures exhaust gas oxygen content, while the air injection pressure sensor measures the air pressure being pumped into the exhaust during cold start. Replacing an O2 sensor will not resolve a P2437 code.

Abstract

Error code P2437 indicates that the secondary air injection (AIR) system pressure sensor on Bank 2 is reporting a signal lower than expected. This system pumps fresh air into the exhaust stream during cold starts to reduce harmful emissions and help the catalytic converter warm up faster. When the pressure sensor reads too low, it usually points to a faulty sensor, a clogged or leaking air pump circuit, or a failed air pump itself.