Driving with oil cap off

Oil cap is there to close off the crankcase--keep in oil--Keep dirt out--let the PCV system operate as it was meant to.

I really do not think it affected your engine at all, You do need to put it back on!

I think maybe you need to perform a tune up, for your engine's performance

If your check engine light is on, take it to a Popular Auto Parts Store....Normally they can read your codes for free.....light on, means there is a problem with you vehicle, and needs some attention.

You can return here with any code numbers, someone here, can steer you towards what needs attention.

The Medic

awesome, that's about what I figured. Already planning another oil change this weekend. Thanks bud

-I had the codes checked and it's th O2 sensor, but oddly enough the guy at Advanced said not to buy the replacement parts... O_o (yes, I'm going to fix it anyway)

I feel sure you have more than one O2 sensor, did the code pin down which one needs attention?

Never heard 'em say don't buy the part---they having problems with them?

If your O2 is down, your vehicle runs in "closed loop" which is inefficient (MPG goes down, etc.)

He give any reason why?

The Medic

Hmm, he gave me a list of 3, I think. He said not to buy them (they were like $30) Because it might be an easy fix and to look online for the fix. But I'm busy and lost the list, so, I'll have to go get retested.