Check up by the manifolds or anywhere before the catalytic converter.
The oxygen sensor is in the top center of the rear exhaust manifold.
oxygen sensor is found either in exhaust manifold or in actual exhaust pipe between manifold and muffler
Just downstream after the exhaust manifold
The fan switch, on your 1986 Chevy, is located on the fan of. The switch will have three wires going to it, from the temperature sensor.
drivers side of engine block
look right before the converter unless your pipes has been changed
On a 1986 Oldsmobile Toronado, the oxygen sensor is typically located in the exhaust system, specifically in the exhaust manifold or just downstream of it in the exhaust pipe. It may be mounted on the driver's side, near the engine. If you're having difficulty locating it, consulting a repair manual specific to that model can provide a detailed diagram and additional guidance.
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On a 1986 Oldsmobile Delta '88, the oxygen (O2) sensor is typically located in the exhaust system, either in the exhaust manifold or just downstream of it, before the catalytic converter. To access it, you may need to raise the vehicle for better visibility. The sensor is usually threaded into the exhaust pipe and can be identified by its electrical connector.
They are supposed to be replaced every 60,000 miles and are located underneath the chassis by the catalytic converters
below exhaust manifold... left hand side... were the manifold joins into 1 pipe becoming the exhaust
Most oxygen sensors are located on the exhaust manifold or just after the manifold on the exhaust pipe(s). Your truck probably has two oxygen sensors, one on each side.