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Discussion Starter #1
Truck: 02 Silverado 4.8

About a month ago, like a dumb shit I washed my filthy engine bay. Shortly after my SES light came on and my truck started gulping gas. I got the code pulled and it was the knock sensors. I found it to be a common problem with water getting in there and causing a short. So I:

* Replaced both sensors with brand new ones
* Checked resistance on the wiring harness and it reads great
* Replaced everything, threw a new valve cover gasket on
* Cleared the code (1 and 1 pending) with a obd2 reader from autozone
* Ran great everything perfect for about 2 weeks.

Just threw the same code again. What would be causing this. The truck sounds perfect and doesnt appear to be knocking. Is there a different way the code should have been cleared? Does the obd2 scanner fully erase the code.
 

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Discussion Starter #4
prior to water getting down in the rear knock I never had any ses. the new knocks metered perfect and have been sealed with rtv. i ran my tank down pretty low and was traveling at a constant 80mph. So I think the gas is probably the culprit. This shit is getting annoying with the check engine light.
 
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