P0021 code, cleared it and won't come back

[Pathfound49]

Last weekend on my way home from work I encountered massive power loss and a horrible running 2003 pathy SE. Limped her home, hooked up the scanner and up popped Poo21. Cleared the code and have driven it the past 7 days. No more problems, but it has me thinking. When will this happen again? Is it the camshaft sensor or crankshaft sensor?

I checked out prior threads on this by Nistech, but it doesn't cover a random/one time occurrence.

[sh8wn9]

I had my camshaft and speed sensors replaced last week. SES light came on so I brought it to get scanned. The guy who scanned it for me cleared the codes and they never came back on again, but two days later I had all 3 sensors replaced to be safe. They said that oil was on them which made them fail, and it was only a matter of time before the light came on again.

[Chuck Tribolet]

If it doesn't come back, don't worry about it.

Chuck

[silverqx4]

My SES light came on so I went and had it scanned and it came back with codes POO11 & POO21 which I was told are pretty much the same except different banks ,is this problem a easy fix as long as I have the tools and parts or should I leave it to the experts? i am not experienced at fixing my own car,the OBD.COM says they are codes for:
POO11= Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
POO21= SAME THING but on bank 2
What could cause this?
Thanks

[Towncivilian]

Please try following the diagnostic procedure on page EC-524 of the factory service manual.