Car starts for about 4 seconds and cuts out every

check the vacume hoses on the motor or around it one may b broken or disconnected hope this helps

Also clean Carbarator flush all pipes and holes some time its solve the problem,

also when you say its turn on for a while and then turn off is it cut off like when RPM drops and then cuts off, and try it either your heater or head lights switch ON it will not cut OFF if this is a case then clean MAF Sensor with Carburetor cleaner or brake cleaner

get it check by using any OBD II scanner if its MAF sensor then it will give you the Error code for O2 sensor but don't rush and start changing your O2 sensor because when MAF sensor is distrub it effect O2 reading

hope it will solve your problem

I have the same problem with my Kia Carnival 2.4L

The engine can turn on for a while then cut off. But it is working fine if I remove the MAF sensor connector.
I did check with the OBDII and found the same error code that youdescribed. Firstly, there is no any failure code. But when the engineis cut off, there are the errors for both O2 sensor.B1 and B2.

I tried to turn on the heater and the head lights but the problem isstill there. Also I swapped the O2 sensor with the other car, still notworking.

Please advise.