Washed my '95 Blazer and took it for a drive to dry it off. Check engine light came on, my OBD scanner doesn't work on this one so off to the parts place that will scan it for free. They told me that the O2 and bank 1 knock sensor. Got a donner vehicle so got the sensor (almost new) and the light stayed on. Went t another parts place and they tell me knock sensor bank 1. They didn't have one but offered to order one for $70. Rock Auto sent one for $32. Replaced it and drove it for a while ligh tstayed on, scanner now not seeing any codes but the light is on.

My buddy Gary turned the computer over and checked the knock module. Darn thing was partially unplugged. Got no idea how that came to be but now that its where its supposed to be, it runs GREAT! Thanks Gary.

 

You might have just fixed mine too. I'll check it out tomorrow if the wife doesn't go to work.It's been driving me bats!

 

Even if unlikely, it is worth checking those easy things! Congrats