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MHD Stage 2 335is not passing NC inspection
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10-27-2020, 03:17 PM | #23 | |
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10-27-2020, 06:16 PM | #24 | |
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10-27-2020, 06:17 PM | #25 |
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OP-
Both Cobb and MHD disable "readiness" for the catalyst monitor in precisely the same manner. Entries for the cat monitors in table of values for various monitors are zeroed out so that the DME always believes those monitors are "not ready" for testing. If the catalyst monitors did become ready in a car without cats, the DME would interpret their output as a cat failure and set the check engine light. So, if your car passed with a Cobb Accessport, it will pass with MHD, guaranteed. UNLESS something else has changed in the interim. Since you have catless downpipes, make sure the MHD box is unchecked, so the MHD will prevent cat monitor readiness. It does not matter if you are in stage 0 or stage 2+ - that's irrelevant to this process. The confusing issue is why your O2 monitor is not setting i.e. becoming "ready". That signifies a different problem. A DPfix is not going to "fix" that. The DPfix works by faking appropriate values for the post-cat sensors - it's extremely simple, in essence just a voltage divider taking a pre-cat sensor output, dividing it roughly in half, and feeding it to the DME in place of the actual post-cat sensor signal. Anyway, if you have a sensor "not ready" you may have a bad sensor, bad wire or bad connector Do you have any error codes? Please report them here. |
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10-27-2020, 06:24 PM | #26 | ||
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But no, i havent captured the screen showing readiness. Its showing not ready right now. |
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10-27-2020, 06:44 PM | #27 | |
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I'm not getting any error codes whatsoever, though. Which is why I'm super confused. |
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10-27-2020, 07:20 PM | #28 | ||
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10-28-2020, 12:06 AM | #29 |
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Your 335is might need a DME software update. My 335is bone stock was not passing the catalyst and oxygen sensors were not getting completed and It ended up being a DME software update.
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10-28-2020, 10:11 AM | #30 |
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I'm not sure why my car wouldn't be updated, but how would I go about getting it updated? Just call the dealer or something like that?
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10-28-2020, 02:37 PM | #31 | |||
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10-28-2020, 02:38 PM | #32 | |
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10-28-2020, 02:52 PM | #33 | |
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10-28-2020, 02:53 PM | #34 |
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10-28-2020, 03:09 PM | #35 | |
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I am going to switch them out for AR resonated though and just asked off the whim if you needed to have the OEM box checked or not when running a dp fix, 1 person said yes, another said no. I haven't done research on it yet, but I'm sure when the time comes I shouldn't be having issues like OP is. Seems like he should either check the box and do a drive cycle, or buy a dp fix and do what is needed for that.
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10-28-2020, 07:16 PM | #36 | ||
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10-28-2020, 07:45 PM | #37 | |
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10-29-2020, 11:46 AM | #38 | |
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I'd expect a code but maybe not. O2 monitor should set (become ready) relatively quickly, compared to the cat or evap monitors. In fact, O2 readiness is a necessary condition to meet before cat readiness is evaluated. I'd start by restoring a completely stock flash to the DME (not just go to stage 0 - remove the MHD code entirely). Then I'd see if the O2 monitor would set. If it does, the DME will proceed to the cat monitor and since you have no cats, when that monitor becomes ready and is tested, it will fail. The CEL will come on and codes will be thrown. But if the O2 monitor does not set, the DME will not proceed to evaluate the cat monitor and you won't get a light. The above procedure will determine conclusively whether this problem is related to the MHD installation or not. If the O2 monitor problem persists with a stock flash, then we can think about further trouble shooting. Let me add that while most cars achieve readiness pretty quickly, some vehicles seem to take much longer, for reasons that are not clear to me. You might want to give it a hundred miles or more before concluding that the O2 monitor won't set. Edit: did you install the MHD on top of the Cobb flash or did you remove the Cobb flash first? Last edited by dpaul; 10-29-2020 at 11:54 AM.. |
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10-29-2020, 05:02 PM | #39 | ||
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01-15-2021, 06:32 PM | #40 | |
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I've had Catalyst and O2 incomplete since October, and many drive cycles and over 500 miles. I flashed back to zero and its not resolved. My last resort was to uninstall MHD completely and try the drive cycles again. If not, try to update DME myself or take it to the shop |
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02-09-2021, 10:39 PM | #41 | |||
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02-11-2023, 08:53 AM | #42 | |
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