Unstable slowdown Peugeot 1.4 Gasoline

Good afternoon I have in the workshop a Peugeot 206 2005 which has unstable the slowdown, the coil, pre -catalyst oxygen sensor, was put in time with a new distribution band, has improved but continues with the problem, in the scanner does not mark any code, a point that you notice is that the second oxygen sensor marks all the time zero. I will be able to revive that it already has me crazy

That fault in Peugeot is fed up if it is with an electronic hazer or with piola the fault could change but the most normal thing is to remove the admission and clean it with diluent duco and remove, the other is that if the battery is disconnected, you must disconnect the negative terminal for 30 seconds, connect it and open and close the contact three or four times, at intervals of 15 to 20 seconds later Start and you will see how improvement.

I have been for two years, failing the slowdown I put the new boards of the Admission collection to clean the injectors and continued failing me, then I have done what the partner says already stopped failing completely, resetting the hordented car of the car removing the terminal of La Vateria the mace has remained phenomenal.

I'm going to do what you tell me and tell you how follows, is piola, although the codes that I brought previously have been erased?

I have seen that failure in a vento, to which self -diagnosis has passed, and not given any failure, well, the failure he had was of a relay that maintained the rpm. and the Scaner did not detect this malfunction.