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Code

P2238

Toyota emissions

O2 sensor positive current — Bank 1 Sensor 1

Toyota: the air/fuel ratio sensor current is out of range.

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Most likely causes

Faulty air/fuel ratio sensor
Wiring fault
Contaminated sensor

Symptoms you may notice

Check engine light
Poor economy

Checks to run

Test the A/F sensor current
Check wiring
Inspect for contamination

Tools you may need

Multimeter OBD-II scanner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

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