This Sentra has a 1.8 litre. Problem: Idles poorly, run extremely poorly when cold. Has 4 O2 sensors. On scan tool B1S1 reads .55-.60, the other three B1S2, B2S1 & B2s2 are fixed between .03 & .09. Car runs lean. Scope shows O2 sensors working. Fuel pressure 4... Login to read more.