Our van is bogging down and the engine sputters. It has to be pulled over as it loses power and restarted a couple of times. After complaining to the dealership (Southern Maryland Toyota Hyundai), they would just reset the check engine light (the first three times) and they claimed that they didn't log us down with the complaint when we most assuredly did (How else does our check engine light get reset?) The THIRD time, they ordered a cadillac convertor to replace the new one (because that's what "the code "says--liek they don't have real auto techs--just machines to tell them what it thinks). They replaced this and the Next Day--the same problem. Took it back in the following week (can't always have the time in the world to take from work for thier ingenuity), they replaced it with another O2 sensor this time. The next day, it was doing the same thing!!! These people don't have a clue and I'm making sure I take it higher than this. Take your vehicle elsewhere.