Q: How many o2 sensor on 91Cadillac sedan deville 4.9

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how many o2 sensor on 91Cadillac sedan deville 4.9

You should have two. One for each side of the engine. However some of the vehicles with this model and year only had one sensor. The best way to find out for sure, as well as diagnose and repair any problem with them, is to have the vehicle inspected by a mechanic, such as one from YourMechanic to be sure.

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