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International Automotive Technicians Network
Re: Exh Back Pressure(p.s.i.)
Posted to Technical Discussion Forum on 1/13/2021

I do not know what the spec is but it looks high. Check the reading with the vehicle off and key on and see if it shows pressure then look into the sensor. If it is not then the tube is likely plugged. They are no fun to clean. The ones I have seen plugged did... Login to read more.