where are the oxygen sensors located on an 87 olds 98 fwd?

1987 OLDSMOBILE 98
97,000 MILES • 6 CYL • FWD
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BOOBOOBEAR77
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I have a clean 87 olds 98 regency that idles too high and get poor mileage. the cat was removed dut to rust thru and replaced with a test pipe. it throws a code for front ox sensor.
Dec 4, 2011 at 10:51 PM
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RASMATAZ
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Heated Oxygen Sensor 1 (HO2S 1) (3.8L VIN K)In exhaust manifold.
Heated Oxygen Sensor 1 (HO2S 1) (3.8L VIN 1)In exhaust manifold.
Heated Oxygen Sensor 2 (HO2S 2)In exhaust system, rear of catalytic converter
Dec 4, 2011 at 10:59 PM
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