[CH4SE]

Just wonder how people are getting on with the work carried out after a few months?

Did anyone consider a decat and map instead off the NOx emulator?

[wrongmark]

NOXEM fitted for a few months now. All seems well. No error codes. MPG back to where it used to be, although I think my sticky front Caliper repair might be responsible for the MPG. Still get a slightly juddery power delivery every now and again but think my clutch/DMF is on its last legs.

[AndyVR]

Originally Posted by CH4SE

Just wonder how people are getting on with the work carried out after a few months?

Did anyone consider a decat and map instead off the NOx emulator?

You know that the NOx system has its own 'special' cat further down the exhaust, so I don't think a usual decat/map would solve anything NOx related.

[CH4SE]

See I have a 330i n53, I bought the car knowing it had flat spots, machanic got fault code for NOx sensor, he reset the sensor and told me drive for 100 odd miles for it to re learn it’s self, got the car back and no flat spots but I’m lacking in power in the mid to higher rev range.

I’m still getting NOx fault codes,

MPG is between 25-28 mixed driving

Car starts fine no misfire, I have noticed on occasion when putting ya foot down it does feel slightly lumpy through the gears,
I’ve also tried forcing a regen with Carly but for some reason it won’t.

Would I benefit from having the Noxemu?

[wrongmark]

A NoxEm will get rid of the error. It will also mean that the engine will run as it’s supposed to (stratified/lean burn/regen etc). It will, in theory, improve the MPG but don’t expect a miracle.

I was concerned with mine running rich all the time and the effect on other components, namely the catalytic converter and oxygen sensors, after having already replaced the latter which wasn’t cheap. Whether this is a reality, I’m not sure as I have a limited understanding.

If you’re thinking of replacing the NOx Sensor anyway, I would recommend going for the NOxEm, but you’re going to need a cable and a laptop with ISTA or DIS to get it to working properly.

Whether this will sort the 'flat spots' and lumpy delivery, I’m not sure. I would imagine there are many things that could be the cause. Is it an automatic gearbox?

[CH4SE]

It a manual,

I think because of the previous issue of flat spots when putting your foot down and the only thing to have resolved the problem is resetting the NOx sensor,

I’m thinking surely it just needs replacing (or the NOXEM)

The guy that works on the car has all the equipment to do the job so that shouldn’t be an issue

[wrongmark]

Resetting the NOx sensor (i.e telling the car that you’ve installed a new one) will only work for a very short period of time because the car will recognise a fault again pretty quickly. Use your Carly app to see if the same fault has returned. If this is what your mechanic has done, and it fixed the problems temporarily, then it might be worth giving a new sensor (or the NOxEm) a shot.

I suspect he may have reset the fuel adaptations too which may have seemed like a temporary fix as the car probably felt more responsive.

[wrongmark]

Bimmer Profs, the company in Latvia selling the emulator, are offering to diagnose your car for free if you send them some live data. Might be worth giving them a try.

[Jet1990]

Can't believe I've only just come across this nox emulator. My cars thrown the error code "nitrogen oxide cat ageing" since I bought it 2 years ago so I reckon the nox sensor is on its way out.

I've also been wanting to decat the secondary cats but haven't due to possible issue from the nox sensor. Would decatting and installing this noxemu trick the car into thinking everything is running as it should be and error free?

[wrongmark]

It basically tells the car 'all is ok' irrespective of the condition (or presence) of the Nox cat. The car will run through the three different modes of operation as normal. It won’t help with the main cats though.

[charmin]

So my understanding is the NOx sensor is just what it says, a sensor and nothing more, from my tuning, modding and coding which I have done a lot, the NOx sensor shows you have either a high nitrogen oxide level, very unlikely unless the car has another serious problem or the sensor is playing up. Normally it is always the sensor just playing up, however that in itself does NOT effect the ECU, the running or anything else, it is just a warning error code. Either live with the engine light on occasionally, often goes out by itself and could be for months or change the sensor... £ 500 I think last time I looked, for a poorly made, dodgy sensor which does not effect the engine at all... it is a warning sensor... they must have made a fortune on replacements... In fact I'm in the middle of seeing if I can code out the warning, I know it's just the sensor so not bothered.
To actually really properly check the levels of NOx is a tricky business, specialist, beyond what most garage has equipment wise and MOT wise, that's why its not in the MOT.

But if you cant stand the warning light and the error code is just the sensor showing short or something similar, high level, you will have to fork out for a new one... or code it out.

[wrongmark]

Yes it is just a sensor, but it does effect how the engine runs. Don’t want to repeat what’s already been said but these direct injection engines (N43 and N53) run a leaner fuel/air mix which results in NOx in the exhaust. If the sensor detects NOx after the NOx cat, it assumes the NOx cat isn’t performing (which it often isn’t) and it will result in the engine running a richer mix, meaning more fuel used and sometimes rougher ruining.

[Jet1990]

Ever since buying my 330i N53 theres been an error code present "nitrogen oxide cat ageing". I'm pretty sure its causing the car to run rich as i get around 16mpg on average with urban driving.

[wrongmark]

Originally Posted by Jet1990

Ever since buying my 330i N53 theres been an error code present "nitrogen oxide cat ageing". I'm pretty sure its causing the car to run rich as i get around 16mpg on average with urban driving.

So it would seem that your NOx sensor is doing it's job. It's recognised that your NOx cat is past its best or not working properly. As a result the car will not run the leaner mix (stratified) as often or at all.

If you did choose to go for the NOx Emulator, you'd use DIS software to perform a replacement NOx catalyst and a replacement NOx sensor. The car thinks you've replaced both with new, the NOxEm tells the car that all is functioning OK and it will run in the various fuel/air mix modes as it was designed to.

I believe coding out the NOx sensor is an option, but the NOxEm is a little more advanced that that, giving the car meaningful readings emulating the normal signals from the NOx sensor.

I'm not on any kind of commission here, but I probably should be! If you can put up with the translation quirks (to be fair it's a lot better than my Latvian), the bimmerprofs website has lots of info on these engines.

Some just decide they'll save their money and live with the richer running (put their cash toward the fuel).

[Dormermike]

I'm going to get one when my NOX dies.

It's more than just a sensor BTW. It is an ECU connnected to a probe.

[wrongmark]

Originally Posted by Dormermike

I'm going to get one when my NOX dies.

It's more than just a sensor BTW. It is an ECU connnected to a probe.

Agreed.

[CH4SE]

Well I’ll be ordering my NOx emulator on Monday, all my fingers and toes are crossed my car’s performance will improve.... here’s all my fault codes

[wrongmark]

Do you have the official Carly OBD device?

[CH4SE]

Originally Posted by wrongmark

Do you have the official Carly OBD device?

Well I’ve got the Carly adaptor if that’s what you mean?

[N43B20A]

Any updates regarding NOX Emulator?

[david in germany]

I actually bought on for my N43 118i. I am pleased to report my mpg has improved from 30-31 mpg back up to 33-34 mpg. The car does feel more responsive as well. I can’t wait till summer fuel is back because the winter mix here always drops my efficiency in my 1er.

[wrongmark]

Had mine for a while now. My MPG is still not great (averaging low 20s). That being said, my commute has changed and is now mainly city driving with lots of traffic. I also have the stop start turned off permanently in the interest of reducing wear on the starter and battery etc (plus I find it irritating with mine being a manual gearbox). No error codes now though and engine starts and runs fine.