Car stalls while idling, now it wont start.

Find out why the light is on. Maybe you broke or dislodged a connector when you replaced the sensor.

check the air intake sensor and the O2 sensor for fouling or damage. If you removed the cat convertor the O2 sensors will not work correctly.

yes it will. Also the EGR system may have a problem now too. When a o2 sensor goes bad it can destroy the egr valve and the map sensor too

I would replace the maf sensor first.It is cheaper.It controls the air fuel mixture for your car and sends this signal to your pcm.It is probably not getting enough gas to idol your car.

I had a similar problem that stalling when slowing down to stop and removing the foot from accelerator pedal. This had been ongoing for almost 6 months. I have taken it to the big service companies who spent hours changing lambda sensors etc....After doing a bit of investiagtion seen that other owners of same car had the throttle valve cleaned (apparently this is required every 30K). I took it to our local one man garage. He reported that he fiddled around with throttle valve using solvent cleaner and general poke around for approx 10 minutes. Since then the car has worked perfectly and has not stalled since. RECOMMEND - MUST CHECK THROTTLE VALVE CLEANED.

your stalling problem could be the egr staying open a peice of carbon will keep it from closing easy to remove and check to see if the pintal is seated or a large vacuum leak will cause havoc with the idle system hot restart problem either the fuel pump or most likely quad driver module a sorry that one cost a few dollars

RPM's up and down check EGR valve and sensor. EGR valve and sensor control idle. That's why your getting the surging on rpm's and this could be giving out the other codes. If mass flow was bad car will not start and the same for the map sensor. O2 sensor measures gas and air for right mixer. TPS controls 0-60 speed as in throttle respons.

This sounds like the loss of electrical power because of the lights.Any chance of a broken engine/transmission mount allowing to much movement and breaking a connection? Along this same line, look for a vacuum leak that occurs while in gear. If the o2 sensor code is for a lean condition a vacuum leak could case it and the drivability condition /stalling you are getting. Hope this helps and rate me please!!

have you checked the fuses?