I have just had the same problem on one of these Canon MF4150 machines.
The manufactures warranty on our machine had expired just one week before this happened so I had to fix this myself.
The problem we had (which is very likely to be the same cause as yours) is when we removed some torn jammed paper, it had somehow pulled off a spring from inside the machine. The spring was linked to the paper jam sensor.
It does involve a LOT of work to fix it, and unless you are very 'techy' it may be quite a difficult task to do this for the 'average' person.
I had to completely disassemble the machine:
Take off the front first (lift up the cover and there is 2 screws at the front and 2 clips on the bottom of the machine)
Then remove the 2sides and finally the top (screws should be easy to see, to get the sides off, un-clip along the front edges and gently move them outwards and slide them backwards to release the clips on the back) being careful with the wires going to the scanner part).
Then look for the fuser unit which is near the top at the back, there is a black rounded cover over the fuser. To remove the cover, look for 2 small clips one at each side and unclip the cover and gently lift upwards.
Under the cover on the left side you will see a small plastic rod which goes from the left side to a small tab in the middle, if you look about half way along that rod you should see a tiny spring, make sure this is clipped on properly and that you are able to rotate the rod and it should spring back to the proper position when you let go.
Once this is done, put it all back together again and it should work fine.
I'm sure a lot of other people probably have this same problem too so I hope this helps someone.
I also had a problem with a constant false paper jam, after I teared a paper after a real paper jam and I did it wrongly, probably damaging in doing so a spring sensor at the paper exit. It is a small plastic rod in the middle of the opening where the paper comes out that just senses the paper, when it's coming out - I damaged the spring holding this rod in place and consequently it was always up (but should have been down until the paper passes - which signals that the paper has come out).
Nothing helped, powering off and again on the printer only resulted in hearing a sound of the wheels mechanism trying to turn, but got stuck.
Disassembled all the external plastics and the top part, reached the black curved plastic where the paper comes out, opened it from the top (fixed in place with 2 plastic hinges on left and right) and there it was the sensor with the plastic rod with a spring out of place. Fixed the small spring, assembled all together and it works.
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it first wrote on the screen close side cover open now it says open side cover paper jam
konica B162 says paper jam open side cover but no paper is there i yhave looked every where
we remove the back part to remove the jam paper and can't figure up how to put the part back
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