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Q: Check engine light came on (code P0138) but disappeared a day later. on 2007 Toyota Corolla

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Few months ago due to recall and check engine light the ECM control was replaced by the dealership. Two days ago check engine light came on; when checked it showed the code P0138 but the light disappeared a day later. Please help me with this.
(3) Answers
Take it back to the dealership and tell them about the problem, maybe the computer-re-flash did not go well.
for this code, you can try this
Replace O2 sensor.
Repair short to battery voltage in o2 sensor signal circuit.
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Hello i would go back to the dealer right away and have them recheck the recall work performed and the re-programing of the computer.HAVE A BLESS DAY from DR.RECO.