redlineshifter

Hi All,

SES light came on yesterday; constant not flashing. Codes read as PO332 (Knock Sensor Circuit Malfunction- Bank 2) and PO153 (HO2S-21 Bank 2 Sensor 1 Slow Response)

-No discernible drivability problems
-o2 Sensors are ~1 year old (NTK Brand)
-Knock Sensors are ~2 years old (AC Delco Brand)

Could just be a coincidence but I would appreciate any insight into problems that could throw both these codes together before I jump in. (Do they share common wiring?)

Not sure if it's relevant, but things I've done in the past day/weeks:

1) Replaced PCV valve with a fixed-orifice style (3 weeks ago)
2) Installed homemade SUX2BU cold air kit (2 weeks ago)
3) Fixed over axle piece on SLP Loudmouth that came lose and caused y-pipe/mid-pipe to sag for several days (day before yesterday)

Any help is appreciated!

redlineshifter

Anyone? Any ideas? I plan to change the o2 this weekend but I'd rather not pull the intake unless I have to.

mrvedit

I'll take a stab at it even thought I could be wrong...
One code may have been "hidden" for a while and you didn't know about it until the more serious code occurred.
"Knock Sensor Circuit Malfunction" could be a broken wire; I have read of various people cracking the wires and not realizing it.

Hopefully others will have more precise suggestions.
In any case keep us posted.

redlineshifter

I cleared the codes Thursday and they haven't returned. Anyone experienced a DTC code that ended up just being a fluke?

I don't usually have that kind of luck but I'll sure take it.