DTC P2237: Oxygen (A/F) Sensor Pumping Current Circuit Open (Bank 1 Sensor 1): Notes

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

NOTE: This DTC is related to Air/fuel (A/F) sensor, although the title is oxygen sensor.

CAUTION: If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction.