Just replaced my t-stat in my 98 4.0. The check engine light came on when I had the temp sensor wire unplugged while burping the system from the temp sensor. I tried unplugging the battery trying to reset it, but it did nothing. Any ideas?
So you got the thermostat properly reconnected and disco'd the battery for 2-3 minutes?
T-stat is in okay. Only had the battery off for about 30 seconds though, so that is probably why it didn't clear on its own. But anyway my local guy cleared the code for free. Thanks for advice on the battery for future reference.