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Being that you have a terrain, your problem is NOT the knock sensor. Locate the 17 digit VIN on your vehicle and contact a dealer and see if there is a timing chain recall that pertains to your vehicle. The problem is the bank one chain actuator is not adjusting properly. I've had to repair a number of these, and it's costly(12-1600.00 and NOT for a DIY'er
most sensors are located at the wheel hub, you should see the reluctor gear mounted on the drive axles in the front, you may need to remove the wheel and rotor to get to it! is it all wheel drive or just front wheel drive, if front wheel drive you should follow the wire that goes to each wheel in the rear, if all wheel drive it may only have one sensor in the transphercase to monitor driveline speed. you really should have some one scan the abs and find out the code/s and diagnose it, just cuase the light comes on doesent mean its the wheel speed sensor, it could be the abs module ect ect..., check the fluid level and make shure its not low and or dirty.