Turning off Check Engine light

The check engine light came on in our '95 Altima two months ago. We made an expensive trip to a dealer, where we learned that the engine knock sensor isn't telling the computer that everything is OK. The dealer quote for replacement was $300+. I asked if it was OK to keep driving, and the mechanic said nothing was wrong with the engine... but at some time in the future, the errant sensor might cause a problem.

We don't have money to pay the dealer. Is there an inexpensive alternative--DIY replacement of the sensor or turning off the check engine light? We have to get the car inspected, and it won't pass with the light on?

not true it will pass inspection my engine check light was on since i swapped 2nd KA20DE into it there's some bs sensors only..