Moderator: volvite
Thanks for the guidance as usual. I’ll investigate further.VStar650CL wrote: ↑Sat Jun 25, 2022 6:04 amI doubt those are all related. P0455/P0456 are both evap codes and generally caused by either a loose gas cap or a bad o-ring at the Evap Vent Valve. P0133 is almost always caused by a small leak in the exhaust manifold north of the cat. Partially plug the exhaust and check for things like pinholes in welds, even very tiny leaks can cause that code.
Once i had the same issue on a NIssan Xterra ( mechanically identical to a V6 Pathfinder except for rear suspension and tune)Pathfinder Pilot wrote: ↑Thu Aug 25, 2022 4:17 pmWondering if you ever fixed the EVAP leak issue? I'm getting a "very small leak" code. Tried a different gas cap and it did not help.
I thought P0133 was a bad O2 sensor ?VStar650CL wrote: ↑Sat Jun 25, 2022 6:04 amI doubt those are all related. P0455/P0456 are both evap codes and generally caused by either a loose gas cap or a bad o-ring at the Evap Vent Valve. P0133 is almost always caused by a small leak in the exhaust manifold north of the cat. Partially plug the exhaust and check for things like pinholes in welds, even very tiny leaks can cause that code.
No, P0133/P0153 are for the A/F Sensors. You can call them "front O2's" but it's inaccurate, they're wideband and work much differently from the conventional O2's in the rear. The codes are for slow response, and on older Pathies and other RWD VQ's, pinholes and cracks leaking oxygen into the exhaust manifold are a frequent cause. If no leaks are found, then a bad sensor is likely.
Thanks. Like a leak where, in the manifold area ? I do very infrequently smell exhaust fumes in the cabin when AC is not on and not in recirculate mode. I’ve just got the P0133 code.VStar650CL wrote: ↑Fri Sep 02, 2022 7:19 pmNo, P0133/P0153 are for the A/F Sensors. You can call them "front O2's" but it's inaccurate, they're wideband and work much differently from the conventional O2's in the rear. The codes are for slow response, and on older Pathies and other RWD VQ's, pinholes and cracks leaking oxygen into the exhaust manifold are a frequent cause. If no leaks are found, then a bad sensor is likely.