How long will the car run between choking and cutting out ? I had this problem but the car would't run any longer than about 5 minutes before doing this. Start the car again and it ran fine again for a few minutes. In my case there were broken wires at the lambda sensor (my car only has one sensor, yours has two but the 2nd one is not involved with fuelling so it would need to be the first one).
It may not be this, just sharing my experience. I couldn't believe that this could happen if there is no Lamda signal, but it was in my case.
I have found that the ECU does not always seem to notice lambda faults - I can unplug mine and it will not always throw a code, so don't assume that the lack of the EML coming on meanse the Lambda must be OK. Best thing is to get the car on a code read with live data - as said a cheap bluetooth one will work as long as the car is not too old - it needs to be OBDII to work with the bluetooth OBDII dongles. Torque is a good app as above, the lite version will let you see Lambda readings.
If you drive with full throttle (very carefully... change up gears at low revs to avoid over accelerating) the lambda signal is ignored by the ECU in the fuelling calculations. I found that when the car was choking if I floored it, it would clear up and drive fine until I backed off again, then the cycle of choking and cutting out would start again . This and the fact that switching off then on again cleared it completely, made me look at the lamda as I knew it gets ignored at full throttle and that any fuelling adjustments based on lambda reading are discarded when the engine is switched off, thus causing fuel trimming based on lambda to start fresh.
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