Sc300 CEL Trouble codes

[$C300]

Hi guys I checked my Engine codes today and I got a 5 and a 6.

5 is a O2 Sensor
6 is a RPM signal (Crank Angle Pulse)

I know what the O2 is but how do I know which one is bad or should I just replace both.

But #6 I have know clue what and were it is.

I checked the codes at this website:http://www.troublecodes.net/Toyota/
(yes i kno it is for Toyota i went there becouse the Lexus one started at 12)

Any help is appreciated.

[Jaxsc3]

if youve got an obd scanner it should tell u a number after the 02 sensor code
they start from front to back the number 1 is the o2 on your headers closest to the cam gears number 2 is the other one on your headers closest to the firewall and so on
as for crank angle pulse im tryin to remember exactly what the fix is ill post up when i do

[$C300]

Tnx ya im thinkin more about havin her scaned now,
and for sum reson when the car is in drive and its idlein or im on the breaks the rpms drop lower then 700 and she startes shaking could this be a result of the o2 sensor or the RPM Signal?

[$C300]

Its rainin here now so as soon as it stops i whould have sum pix