my check engine light comes on and off so i took it to auto zone and they told me it was my knock sensor.

first of all, they are parts salesman, not techs.

a code never identifies a bad part, just a failed system.
you need a shop with a scan tool, not a code reader, to monitor the knck sensor to verify if it is working properly and the wiring needs to be checked as well.

Roy

[quote]first of all, they are parts salesman, not techs.[/quote]

AMEN

I was check my car with OBD 2 and result problem code P1127 , before I repaired, I was changes O2 sensor, MAF unit, but now check engine light come on, some time to off light I tried to open ECU fuse after that key ignition on, after that to off key , Ecu fuse installed again, continued try key ignition on and started engine , check engine light not come, if I use driving a car suddenly check engine light come again, Please tell me how to solve my car problem , thank's

stop with the fuses. you need a shop with a scan tool that can monitor the sensor activities. without a scan tool you are spending a lot of money on items that dont fix the car.

Roy

My shop fix car say with me and they asked me the problem Code diagnostic car P1127 , they not find place how to fix as by code P1127 , could you info me , after that I talk to repair shop car to repair my car as your suggestion, thank's I wait info from you soonest, thank's