Hello!

I just bought a 2004 Ford Focus about one month ago. It has over 90,000 miles on it already, from the previous owners, but it's my first car &amp; seemed like a good deal, so I didn't think much of it.

About a day after getting it, the engine light turned on. I went back to the dealer, and they said it was a problem with the sensor, not the engine, so they changed it for me. Well, the light turned back on the next day, and I ignored it. I've noticed that my car will randomly shake when I'm idle. It usually happens when I'm at a red light for over 30 seconds. And sometimes when I put my car in park, it will stall out almost immediately (although I never had an issue starting it again). I took it to a local car shop &amp; told them the issue, they hooked it up to a computer diagnostic, and nothing came up. They reset the sensor to turn off the engine light, and AGAIN it came back on the next day. I changed the air filter, but it didn't make much of a difference in the shaking.

It drives pretty smooth. Just an issue with the idle.

Any suggestions?



Thanks!