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2004 Cadillac CTS 3.2L 5sp man trans. 2099 error code,

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The 2099 code keeps popping up about every 3 to 5 days always when in 3rd gear between 30 - 35mph . All O2 sensors have been replaced. Where else should I look to fix this code?

Vehicle: 2004 Cadillac CTS 3.2L

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