im getting a code po301 303 305 on 2007 Suzuki XL-7

my suziki 2007 xl 7 had a timming chain put in it oil pump put in it number 4 valve spring repaired. Now engine light is on showing a cam sensors bad and timing out 4 degrees.What can i do to fix

Asked by for the 2007 Suzuki XL-7
We also just had our timing chain replaced and cam phasers. First mechanic turned down the work. Second mechanic said some mechanics will not attempt to reset timing chains cause they r so tricky/aggravating to get lined up. You might need to take it to someone else who has had a little more experience or feels more comfortable replacing those. We worked with a master mechanic. The cams were pretty expensive to replace. Hope that helps.