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some have 2. both are easy to fix. one is on the back of the engine compartment. hope you have small hands and an adjustable wrench and dw 40 to loosen it. the second sensor is under the car near the catalytic converter on the exhaust pipe.

if you changed both and you still have the check engine code its the catalytic converter that is bad.

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Q: How many oxygen sensors on an 03 impala 3.8l?
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