96 expl sport 4.0L and 5 speed 100,000 miles
Check engine light came on and 3 codes were on

P0135
P0141
P0155

I just had the Bank 1 Ox sensor replaced about 2 months ago. Truck runs ok but did notice idle was high for awhile then back to normal. I cleared the codes twice ,but come back on next time i drive. Anything i can do to fix or does it need to go to the shop. What should i be looking for? thanks for any help.

ok boss here u go...

P0135:
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

P0141:
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

P0155:
O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

hope this helps...check out http://www.2carpros.com/mechanic/diagnostic_trouble_codes.htm

good site

Found out there is a 15 amp fuse in the panel in the eng compartment that goes to the o2 sensors. It was blown, changed it and all is well.