About six months ago, the check engine light came on (96 850 Turbo - 94K miles). I got the OBDII codes read and cleared at AutoZone. The code at that time was for the Front O2 Sensor. The light stayed off until last week.

This week there is a distinct (and disappointing) loss of power under acceleration. Last night, I went back to AutoZone to read the code and this time it said "Knock Sensor ICKT Range Performance Bank 1".

I never burn anything except premium fuel (92 octane or better). Anyone got any suggestions on what is going on? Do I have bad sensors? Or is something else happening that the sensors are detecting? Are the two codes even related?Or should I not be relying on AutoZone to read my codes?

Please help! Thanks.

Does AutoZone scroll down to see other codes, or do they just stop at one code? The knock sensor will retard the timing as a save your ass feature if the engine temperature exceeds the norm by more than 40 degrees Celsius, or if the engine rpm's exceeds 2500, or, of course, if it senses a knock. So...codes that could come along with this code would be the engine coolant temperature sensor, the engine speed sensor, or a misfire on cylinder ___ (pick a number 1-5) code. How long has it been since a tune-up? Cap, rotor, plugs? A misfire or a badly worn plug will create pre-ignition ping. Has the temp gauge been erratic? Questions...too many questions...sorry...and I hope this helped.

Thanks! More than I knew about it, that's for sure. A place (or places) to start. I'll dig in and find out more. Again, thanks!