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'95 850 Wagon O2 sensor positions

I'm getting an error 4-3-5 for the FRONT O2 sensor. My question is: are both sensors (front and rear) attached to the exhaust pipe?

I have a Turbo model and can see one of the sensors attached after the turbo, but before the cat convertor. IS THIS THE FRONT SENSOR?

I haven't been under the car in a few months and cannot remember seeing two connectors to the exhaust pipe.

Thanks for the help.

dp







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