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2014 F 150 XLT 3.5 L Ecoboost
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Discussion Starter #1
My check engine light recently came on so I took it to a shop to see what caused it. The report I received didn't give a specific code, but instead, said L upper Emission System Oxygen sensor. Does anyone know which side the left sensor is? I know its before the catalytic converter but not sure which side, driver or passenger.
 

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Modinstrator
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3,167 Posts
There are 4 O2 sensors. I’d assume this shop knows the left side of the vehicle from the right. That being the case it would be the front sensor on the drivers side.
 
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