Honda is reading po135 but o2 sensor changed(twice), check engine light still on?

My Husband and I bought a car. 2004 civic coupe LX automatic. Check engine light came on, we got it read and it came up po135, a code for camshaft position sensor intermittent signal and the Electronic load detector. We got everything we needed and bought some extra tools. My husband fixed the timing belt that was just changed previously (it was off a tooth), changed everything it said to fix, but the code is still on. He went to a dealership, had it reset, drove home engine light went back on. We tested the O2 sensor it was good but replaced it just in case. My husband checked the wires for the circut, everything was fine from what he could tell, He checked fuses, tested resistence, checked for a open or grounded wire, basically a lot. The P0135 code still comes up. My husband suggests a new PCM install it, big surprise, not the PCM. The car runs just fine and other than the check engine light you would not know there is a issue. Is their anything else we could do before we spend hundreds of $ we do not really have to get this car on the road? Its too late to sell, we have lost so much money might as well go for fixing the darn thing.

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