EVAP error codes P0455 P0133 and P0456

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Limey
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EVAP error codes P0455 P0133 and P0456

Postby Limey » Fri Jun 24, 2022 8:42 pm

I have a P0455 , P0133 and P0456.
Can anyone guide me or link me to a solution to these please? thanks.


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VStar650CL
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Re: EVAP error codes P0455 P0133 and P0456

Postby VStar650CL » Sat Jun 25, 2022 6:04 am

I 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.

Limey
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Re: EVAP error codes P0455 P0133 and P0456

Postby Limey » Sat Jun 25, 2022 8:23 am

VStar650CL wrote:
Sat Jun 25, 2022 6:04 am
I 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.
Thanks for the guidance as usual. I’ll investigate further.

Pathfinder Pilot
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Re: EVAP error codes P0455 P0133 and P0456

Postby Pathfinder Pilot » Thu Aug 25, 2022 4:17 pm

Wondering 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.

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palmerwmd
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Re: EVAP error codes P0455 P0133 and P0456

Postby palmerwmd » Sat Aug 27, 2022 7:22 am

Pathfinder Pilot wrote:
Thu Aug 25, 2022 4:17 pm
Wondering 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.
Once i had the same issue on a NIssan Xterra ( mechanically identical to a V6 Pathfinder except for rear suspension and tune)
I went to an independent and he noticed the evap canister was damaged and bent for some reason ( maybe a rock somehow flew up there and hit it)

He was able to mostly push out the dents and years later it is working fine ever since.
Otherwise u may have t spring for a new canister if u want to get rid of that light on the dash.
And I think u do, because if u leave it on, you may miss a more important error message in the future

Limey
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Re: EVAP error codes P0455 P0133 and P0456

Postby Limey » Thu Sep 01, 2022 10:28 pm

VStar650CL wrote:
Sat Jun 25, 2022 6:04 am
I 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.
I thought P0133 was a bad O2 sensor ?

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VStar650CL
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Re: EVAP error codes P0455 P0133 and P0456

Postby VStar650CL » Fri Sep 02, 2022 7:19 pm

Limey wrote:
Thu Sep 01, 2022 10:28 pm
I thought P0133 was a bad O2 sensor ?
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.

Limey
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Re: EVAP error codes P0455 P0133 and P0456

Postby Limey » Sat Sep 03, 2022 9:17 pm

VStar650CL wrote:
Fri Sep 02, 2022 7:19 pm
Limey wrote:
Thu Sep 01, 2022 10:28 pm
I thought P0133 was a bad O2 sensor ?
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.

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VStar650CL
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Re: EVAP error codes P0455 P0133 and P0456

Postby VStar650CL » Sun Sep 04, 2022 6:32 am

In the area of the front sensor before the cat. Air leaking in there during Miller-cycling will oxygenate the exhaust flow and cause the A/F sensor to under-respond. The easiest way to locate pinholes is to block the exhaust, the backpressure will make even small leaks fairly obvious.


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