p2237
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Toyota · SUVs
O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 1
Quick Answer
Error code P2237 on your Toyota SUVs means: O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 1. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
4Runner TRD Pro 2024Grand Highlander Limited 2024Highlander XLE 2024Highlander Hybrid Bronze Edition 2023Land Cruiser 1958 Edition 2024RAV4 XLE Premium 2024RAV4 Hybrid SE 2024Sequoia Capstone 20244Runner Limited 20244Runner SR5 20244Runner TRD Off-Road 2024Grand Highlander Platinum 2024Grand Highlander XLE 2024Highlander LE 2024Highlander Limited 2024Highlander Platinum 2024RAV4 Adventure 2024RAV4 LE 2024RAV4 TRD Off-Road 2024RAV4 XLE 2024Sequoia Limited 2024Sequoia Platinum 2024Sequoia SR5 2024Sequoia TRD Pro 2024Venza Limited 2024
Likely Causes
How to Fix It
1
Inspect the Bank 1 Sensor 1 A/F sensor connector for corrosion or water damage
2
Measure the sensor circuit voltages at the ECM connector and compare to wiring diagram specifications
3
Test the A/F sensor wiring harness for continuity between the sensor and ECM
4
Use a scan tool to monitor A/F sensor current output and compare to expected values
5
Replace the air/fuel ratio sensor if the internal pump cell has failed
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Air/fuel ratio sensor (Bank 1 Sensor 1)
Wiring harness repair kit
Dielectric grease
Connector sealing boot
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