I had my Knock Sensor replaced a few weeks ago, along with the rear O2 sensor. I just checked my ECU and it reported 0505.

Do I have to reset the computer?

How do I return to normal operating mode (from diagnostics mode) without resetting the ECU?

Thanks,
Sam

 

did you replace the knock sensor by yourself?
if not how much did they charge you to replace it?
how much did they charge you to have the 02 sensor replaced?

by the way, my dad's 96 GLE read the code 0505 so i thought everything was ok. and i also turned the CEL off for him.
The next day, it came back on, so i took his car to Autozone where they check your CEL for free and it turns out that he needs a new knock sensor, gas cap, and some other EGR stuff.

 

You don't have to reset the ECU. After you read your codes, don't turn it clockwise and back again, just turn on your car and its all good.

 

I bought a NEW KS from Ebay for $90. My AMAZING mechanic replaced it for me in about 15 minutes. No charge.

He also did the O2 sensor, $120 part and labor.

 

Thanks PoePoe2797. That sounds easy enough.