NefMoto

Hello there!

I've got a question regarding the working of my first lamda sensor. The previous owner of the car replaced the front O2 sensor with a brand new one OEM one to no succes so i can be 100% certain this is not the issue here. Now i do know it has most likely something to do with the N249/N112 Mod, my car has these valves physically removed. (I bought the car like this). Now the 2 plugs which should be for these valves are wired up to some kind of resistors. I have tried 2 different types of resistors also to no succes.

The error code that comes up on my generic OBD scan tool is: P0130 which basically says there is an error in the first lambda's electronic circuit which i guess makes sense. If i use my MPPS cable it also shows another error code which is P1287 something to do with an electrical failure in the N249 valve, which i don't have. What could i try in order to get the first lambda to work again?

Help would be greatly appreciated, thanks in advance!

Flash stock file
Clear dtcs
Start engine
Start vcds engine measurements 033
Wait until o2 regulation begins
If you see -25% and after that 0% and error code comes than it's basically rich afr poisoned o2

Thanks for the tip, i considered flashing a stock file but to me it seems this would only make matters worse. This car has had a bunch of engine modifications and software mods alike. To name a few; it is running without a MAF, no N249/N112 system, 4bar FPR, and probably a bunch more. I am happy with the power it delivers but this is the one thing that i cannot get my head around. Im just figuring out what options i would have to resolve this..

Probably bad emission delete or fueling
Anyway you can do same thing on your file but it's slightly harder to sort it out then

Just try and enable back, one by one, the REAR O2 sensor deletes on your tuned file.
Thus you will be able to pick which of the REAR sensor deletes causes the P0130 for the front sensor (probably the ageing check, but try yourself).

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oh, and searching for P0130 on nefmoto will bring up a lot of similar cases...

Good tip, i will search the forums for a bit more!

I don't think it is caused by software though, since the rear O2 isn't deleted and still functions with a spacer in between. The voltages on the rear O2 are totally fine, its just that the front O2 doesn't do anything at all. I have a reason to believe this is caused by the missing N249 or N112 valve but i can't seem to understand why since they are wired up to resistances.

Another leon guy...

Mafless?? how does it seem to run? most seem to suggest a bad idea, but then..... always interesting to see something different

These are literally all of your issues.

From what a mechanic told me its only really necessary on high HP builds so talking 400-500+. But if you want an actual blow off valve (which my car has) you also need to run the engine without the MAF. This because the OEM diverter valve will put some air back into the intake if im not mistaken. If you were to go for a full BOV the system would throw error codes because it would detect the diverter valve is not operating as it should.

The car runs amazing only thing that bothers me is the check engine light for the lambda not working. It suspect it might run a little better/cleaner with it working but i'd either like to fix the actual issue or just delete the code, since the car performs and runs well.

Perhaps they are, im just trying to figure out how to get the lambda to work correctly. Either through hardware modifications or a software fix.

A BOV on ANY car is retarded. Stock DV system works perfectly fine even past 600 HP.

I'm still in the process getting to grips with the me 7.5 platform, but happy to share my notes with you if you wish.

I'd be happy to learn anything i can. So please feel free  ;D

As for the BOV, for you it may seem retarded but i too prefer the louder blow-off sound. I wouldn't go as far as to handicap the car myself in order to run one but i simply bought it like this and it functions fine.

Everything "runs fine". No proper load acquisition, no closed loop control. "Fine".
Not a single log, "fine".

I love this thread.

Instead of being sarcastic you could also share your knowledge, im here to learn and this doesn't help me one bit. To me as a noob it seems that the car runs as it should thats all i am saying.

Only thing i know for certain is that there is no lambda regulation and i would like to know how to fix it. Either software or hardwarewise. Now what information could a log contain to help me figure out the cause of the issue?

Literally all information.

Absolutely everything, including the error status bits that are set and it will show exactly why that error is happening.

I mean if you just came here to chat about how awesome your car is, you may continue.

If you actually want your problem solved, you better learn to use ME7Logger.
Also good idea, as was said here earlier is to flash it to stock and only set the injector variables so that it more or less runs. Then see if o2 feedback becomes operational.

So, I'll share what I've learnt.  BOVs that go to air are a bad idea, it will be covered on this forum and about 1000 others.  The reason is mathematical, the MAF measures the amount of air that has gone into the system, by using a recirc this air is a known quantity always, if it goes out of the system via the BOV, you end up with the car thinking it has absorbed x amount of air, but this is then vent out, so other sensors which are expecting that volume either throw an error or just throw the amount of fuel in for that expected air that isn't there.  The results usually aren't great.

As they have said (in an internet forum kinda way :P) is that your best bet if you wish to play with the ecu etc is go to a known configuration and go from there, and using a tool like me7logger is just damn useful.

So my experience so far with me 7.5 (I've covered MS43 before) is that it is an advanced little unit, and I've seen the map that we got from a mapper and there are some issues it, however unless you know exactly what the mapper has done you won't know the reasons they did the bits they did, so starting from scratch is the safe way to do it because you at least know what is being changed.

Spend the cash on an FTDI cable, run a vm on a laptop, and just log, log and things start making more sense.

I ordered a KKL interface cable which should contain the FTDI chip if im not mistaken. I also read that an authentic Ross-Tech cable could work on their site, so i will try that later this week since i have a friend who owns one.

Im certainly not here to just brag about my car it isn't anything special really. So i certainly will try to log using ME7Logger and go from there. I hope this may help resolve the issue before needing to flash a stock file, because im afraid it might do more bad than good. Would it even run on a stock tune without a MAF, without secondary air injection system and higher fuel pressure pump? I just want to be certain not to destroy my engine.

The MAF was deleted by JD (local tuning company with a good rep), and i know they usually delete those at stage 2 or higher. I have no clue why though, because as it seems everyone is against it for reasons i do understand.

Thanks for taking the time to help a total noob out though, appreciate it alot. I'll be sure to log the car later this week when i get the chance. (If it can be done through a Ross Tech cable, otherwise ill have to wait for mine to arrive.)

Fuel pumps do not have a fixed pressure - they are controlled by a fuel pressure regulator.  You haven't fitted a higher pressure one - likely one with more flow.

There is no reason to delete the MAF - people have this obsession that they think they melt or shit.  Fit a MAF, known injectors and fuel pressure regulator and a stock file with only KRKTE and TVUB editted to suit.

If you want the deletes done, post it and I'll do it.

Hello there!

I really appreciate the offer but i am looking into editing so myself. I figured out the O2 sensor is in fact working and logged it through VCDS. Values vary between 0,1 and 4,9v which should be fine since it is a wideband sensor. I checked all the wiring but the code keeps coming back while i confirmed it does function well. Reason i thought it didn't work is because my OBD scan tool apparantly can't measure above 1V. I can post the logs if anyone would be interested (VCDS log). I also figured out i am not the only one with the problem with what seems to be a "ghost code" since the hardware appears to be functioning well.

What i am looking for is a way to edit such specific maps. I know i need a definition file but i don't know where to find one for my specific model. It should be 06A906032DE. If anyone could help me out with that i'd be extremely grateful.

Ill link the log down below for anyone willing to have a look

https://gofile.io/?c=do0vyY

Log is useless.  Use ME7Logger or bust.  Ghost codes are not a thing.

You'll need to make a definition file if you don't have one.  It's tedious.  You cannot code out front O2.  Post a proper VCDS log too.  P1287 codes up as System too Lean and N249 oddly.  Check trims.

This MAFless shit and other stuff is likely fucking with stuff you have no idea about.  Flash stock or we're all wasting our time here.