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If the check engine light comes on in your Toyota Camry, the first step is to pull over immediately. Once stopped, you can check the engine's ECU for any stored codes. If you find code P2238 after scanning the ECU, it indicates low voltage in the O2 sensor heater circuit. This typically indicates a wiring issue leading to the O2 sensor. Check the wiring for any damage; if it appears fine, the problem likely lies with the O2 sensor itself and should be replaced to fix the issue.
P2238 is a generic OBD-II code that indicates the engine control module has detected a short circuit in the heater control circuit for the O2 sensor in bank 1, sensor 1.