I recently over-heated blew a gasket and cracked a head, so i decided to replace my engine completely. Has been installled but engine light is still on/ I went to a garage to clear the codes but they pop back on. The codes were two form a oxygen sensors, i think the same one and the high fan is off. What is the high fan? And were is the location of the oxygen sensor located? also i have been having a noticable vibration when i am at low rpms around 30 and 40 mph any ideas please help

also after i cleared codes the air bag light is on, th engine light is back on , when i turn on car the light will blink before it turns on

 

Sounds to me like there are some unpluged wires.....As far as the o2 sensors they are in the exhaust and there is between 2 and four of them depending on the car and motor setup.The vibration could be your driveshaft or something in the clutch or as simple as snow frozen in the rim!My advice is too look around at stuff and see if anything looks disconnected or loose and go from there

 

Definatly check the connections on the O2 sensor. If everything looks good, before you replace them drive the car for a while. Usually when the headgasket goes the cyl. will fill with coolant and spill into the exaust (this is why you see white smoke) It will take forever for the coolant to burn out and any fluid/moisture/gunk on te O2 sensor could cause it to missread.

 

check / replace the 02's and the high fan your referring to is likely the high pressure switch for the A/C, when the AC is on max the sensor will kick the fan on high, reguardless of engine temp