96 villager knock sensor 1 fault code

[gandhi001]

Recently, my wife was driving the above van and it stalled on her at a red light. Moments later, she was able to restart it.
I had Autozone check for code, it says "Knock Sensor 1 Fault", I think the code was P0135.

What's this due to? AND, should I replace it? Or is this bad gas causing problem?

Autozone sells a new knock sensor for about $175. Is that the only item that requires replacement, or is it a major job to get to it?

Thanks.

P.S. The van has 99000 miles, but I'd like to keep it for 1-2 more years, so some reasonable expenses would be OK.

[IH8SPM]

LEAVE THAT THING ALONE. It only has one purpose and that is to tell you that something else is wrong with your van. Get a tune etc done. You may have many other symptons that caused that code. I would ask her if she used a diffrent grade of gas that can sometimes trigger that code. It is there to sense vvibrations and detonation I think is the term. Do not replace it the part is 175 the labor is 5 time that.

[aaamillertime]

I would definitely agree with IH8SPM . You probably did have something rattle around in the engine when it stalled. Maybe a miss or something cause it to vibrate the motor then stall. Triggering the sensor. Tune -up & oil change time.