OBD-II Error Code P2040: Exhaust Gas Temp Sensor B2S2 Range – How to Fix It

Q: What does Bank 2 Sensor 2 mean?

Bank 2 refers to the side of the engine that does not contain cylinder #1 (usually the passenger side). Sensor 2 is a downstream sensor located after the catalytic converter or diesel particulate filter.

Q: Can I drive with code P2040?

You may be able to drive, but it could affect emissions and fuel economy. In some vehicles, it may trigger a reduced power mode. It's best to diagnose and fix promptly.

Q: How much does it cost to fix P2040?

DIY cost for a new EGT sensor is typically $50-$150. Professional repair including labor can range from $200-$400.

Q: Will clearing the code fix P2040?

Clearing the code may temporarily turn off the check engine light, but the code will return if the underlying issue is not resolved.

Q: What other symptoms might I notice?

You may notice decreased fuel economy, increased emissions, or the check engine light. In some cases, the vehicle may go into limp mode.

Abstract

Error code P2040 indicates that the exhaust gas temperature (EGT) sensor on Bank 2, Sensor 2 is reporting a signal that is out of the expected range. This sensor monitors exhaust temperature to protect the engine and aftertreatment systems. A faulty sensor or wiring issue can trigger this code, potentially affecting emissions and engine performance.