[kurtr]

I started this thread last May, but have finally gotten around to fixing the van. I thought I would post just to complete the thread. I swapped the O2 sensors and the problem followed the bank -- not the sensor (excellent tip, wiswind). After I took the cowl off to look at the back of the engine I could clearly see some sort of bracket above the valve cover that was loose. This bracket held some vacuum lines that were also disconnected. I'm certain the mechanic that did my head gasket forgot to screw this bracket back on after the job... 2 months later is when the CEL came on.

Interresting, the CEL did NOT go off automatically after a week of driving (including highway driving). Stumped me. The guy at AutoZone reset the codes and then the light was off for good. Today it passed the OBD test for Illinois emmisions.

I should have just done a closer inspection last May. I am now over my fear of taking off the wipers/cowl to get access to the back of the engine. Taking all that apart is really no big deal. I read posts some time ago where guys were changing spark plugs from UNDER the van! I cannot imagine as taking the cowl off is so easy.

Thanks for the help... another sucessful DIY repair!