I have a 2005 Chrysler Town and Country. The check engine light has been on for a few months, to change an o2 sensor. I brought it in two weekends ago and had it changed out. The light went out for two days then came back on. After the light came back on it started running rough. I brought it back to the shop this weekend and it turns out they were sent the wrong upstream o2 sensor and changed it to the correct one. The light stayed on for 2 days and has now gone out but the car is still not running right. Whenever I am at a red light it feels like it is going to stall but hasn't yet. Any ideas what the problem could be? Also I had a tune up done the weekend before I had the o2 sensor changed, could the wrong sensor have any effect on the coil pack or spark plugs?

 

Well the problem has been resolved. The misfiring was caused by the coil pack, they had changed the spark plugs and wires previously but did not change out the coil pack. Once that was changed the misfiring stopped. The check engine light from the O2 sensor was a problem. The sensor was changed out a 3rd time and the light still kept coming on. I did a little research and found that the Bosch sensors do not get along well with the 2005 town and country, I had them put a Denso sensor in and the light went out and has stayed out.