hi all i have coil light on dash and lost power on my 2005 dci primastar 100 , still runs but safe mode comes on at around 50 mph after restart so hooked up snap on scan tool and read code as follows- p0032 ho2s heater control circuit high bank 1 sensor 1, ive read this is front sensor before cat on manifold if so how easy is it to reach top side as ive no ramp? also saw universal four wire 02 sensor on fleebay for peanuts, are they any good or compatible? nissan told me there wasnt 02 sensor on my van!!!! wtf? any help please?