Replaced radiator on bmw z3 roadster,

There is no one fix works on this O2 sensor code
P0170 - Fuel Trim Malfunction Bank 1
Possible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection

Verify radiator is clear and getting air through it. Once engine starts to get warm, spray radiator down with cool water and see if the temp goes down.

try the engine breather pipes first ,if that doesnt work clean the idle control valve

you can't bleed just the radiator, you have to bleed the cooling system through the bleed holes while it's hot and pressurized and running.

two areas: bleed valve on thermostat housing, or overfill cup next to radiator.

it probably does. you will have to contact the dealer and see if they have any advice on what you can do to fix it.

I too had similar problem when replacing the thermostat on my Z3. My advice is top up with more coolant and check the level.

Isn't there a rear sensor by the catalytic converter also?

the problem could be in air mass flow sensor, but it's expensive

BMW engine light

Comes on if DME engine management system self diagnostic fault detected. Will stay on until codes are called up and memory erased.

With OBD read the code as follows. Turn on ignition key, press accelerator pedal to the floor five times within 5 seconds. The check engine light will remain on for 5 sec , blik off, come on for 2,5 sec, go off for 2,5 sec and fault code will begin to flash. If more than one fault exist 2nd fault code will be separated by 2,5 sec pause. after fault codes there will be a 0.5 sec flash and light will remain off. to read codes again do procedure again.

Canceling of codes. make sure fault code is present (short blink and light goes out for long period), depress throttle pedal for at least 10 sec. read fault codes again and check for code 1444 (no faults stored.)

Check also the following, fuel pump, oxygen sensor, fuel injectors, engine coolant temp sensor, idle speed control valve, mass airflow sensor and too many other things.

it seem like you are having problems with the ignition switch,replace it and it should be fine.goodluck"!!!