Blown o2 sensor? (1 Viewer)

[nyk438]

Was offroading a few days ago and I slid off a rock wrong and landed on the heatshield and the cats. Right after that my check engine light comes on. Now what bothers me the most is the idle is really shaky, rpms don't seem lower just the truck idles rough and sahkes almost violoently from a cold start. Could an o2 sensor cause a rough idle?

 

[Hltoppr]

What code is the check engine light indicating?

-H-

 

[nyk438]

Picked up a Haynes manual today and I'm going to pull the code tomorrow. My idle was rough right after I hit the cats on that rock. I assume thats why it's idling rough, but I remember last time I went through water I had this same trouble and I did go through water.

 

[nyk438]

Pulled the code today, have a code 21 which is the main o2 sensor. Looks like I'll be needing a new one from CDan soon as I get the money they're what 130 bucks?