DTC P2237, DTC P2238, DTC P2239, DTC P2240, DTC P2241, DTC P2242, DTC P2251, DTC P2252, DTC P2253, DTC P2254, DTC P2255 Or DTC P2256: Notes

WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

Code Definition

DTC P2237: Oxygen Sensor Pumping Current Circuit Open (A/F Sensor) (Bank 1 Sensor 1)
DTC P2238: Oxygen Sensor Pumping Current Circuit Low (A/F Sensor) (Bank 1 Sensor 1)
DTC P2239: Oxygen Sensor Pumping Current Circuit High (A/F Sensor) (Bank 1 Sensor 1)
DTC P2240: Oxygen Sensor Pumping Current Circuit/Open (A/F Sensor) (Bank 2 Sensor 1)
DTC P2241: Oxygen Sensor Pumping Current Circuit Low (A/F Sensor) (Bank 2 Sensor 1)
DTC P2242: Oxygen Sensor Pumping Current Circuit High (A/F Sensor) (Bank 2 Sensor 1)
DTC P2251: Oxygen Sensor Reference Ground Circuit/Open (A/F Sensor) (Bank 1 Sensor 1)
DTC P2252: Oxygen Sensor Reference Ground Circuit Low (A/F Sensor) (Bank 1 Sensor 1)
DTC P2253: Oxygen Sensor Reference Ground Circuit High (A/F Sensor) (Bank 1 Sensor 1)
DTC P2254: Oxygen Sensor Reference Ground Circuit/Open (A/F Sensor) (Bank 2 Sensor 1)
DTC P2255: Oxygen Sensor Reference Ground Circuit Low (A/F Sensor) (Bank 2 Sensor 1)
DTC P2256: Oxygen Sensor Reference Ground Circuit High (A/F Sensor) (Bank 2 Sensor 1)

NOTE: This DTC may be caused by the vehicle running out of fuel.

NOTE: DTCs P2237, P2238, P2239, P2251, P2252 and P2253 means malfunction related to bank 1 A/F sensor circuit.

NOTE: DTCs P2240, P2241, P2242, P2254, P2255 and P2256 means malfunction related to bank 2 A/F sensor circuit.

CAUTION: If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM electrical connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction. On models equipped with engine immobilizer, if ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.