Replaced mid sensor and check engine light went off for about 500 miles and then came back on. Should I change the front sensor as well?

 

Take the car somewhere to be scanned. Could be something completely different. Don't just start throwing parts at it.

 

I took it to a parts dealer and they didn't tell me the codes. Is it better to take it to a dealer?

 

So they scanned it, and quietly walked away. They didn't say anything to you? I am lost.

You can jump the service connector to see what code is being thrown, too. You can also reset the ecu and see if the CEL comes back on.

 

Are we talking about oxygen sensors here?

 

^^The OP says he has a CEL on. I told him to get it checked. /story

What he did before the CEL came on doesn't matter to me at this point.

 

Yes I read that he has a CEL on but he doesn't state what sensors he's talking about. /story yourself. LOL!

 

It doesnt matter what sensor he is talking about. The beginning of his post states he had a problem with a sensor, fixed it, and after 500 miles another problem popped up.

How does the first fix have anything to do with this new problem? Nothing right now... only becuase the OP hasn't told us what this "new" problem is.

Noobs need to just stop attempting to give help or go to honda-tech to give "advice".

 

As he stated....the CEL came back on therefore he did not fix the problem. Learn how to read. Hahaha. Looks like you're the noob. I've forgotten more about these cars then you'll ever know. Just because I'm new to this forum means nothing and proves your intelligent level. Zero!

 

500 miles is a bit much to reset all monitors buddy. Most monitors are set after 50-100 miles at most. 500 miles and the same sensor dying out means another problem is causing it. We can speculate all we want, but nothing matters until the OP can tell us what the CEL is on for.

EDIT - I am sure your statement about how much I know is not true. I am not just some kid and I have been doing this for over 12 years as a hobby.. plus, I work in the auto industry. Mainly aftermarket stuff, though.