SES light on: 4 CODES came up (Need help)

[Engz]

GURUs needed!

Okay I finally got my car diagnosed. I procrastinated a while on getting my ECU scanned because I didn't want to put down the $160 for just a scan. Then I found a guy around my area that scanned the ECU for $30. Which was great. So if you're in the Queens/BK area, I'll recommend you to him if you want.

4 CODES came out.

1) 140 Activation map cooling.
- This I dont know what it means. Does anyone have experience in this.

2) 113 Signal, Camshalf position Sensor bank 1
- Will be replacing the sensors this week.

Now these 2 last codes I couldn't figure out.

3) 028 Additive mixture adaptation, bank 1, control limit reached

4) 029 Additive mixture adaptation, bank 2, control limit reached.

Can someone with experience with these codes enlighten me what they are and what you did you fix it.

I just want to make sure that if I do bring it to the mechanic, I know what the issue is before they do. I like to know what's going on with my truck before someone else does.

Thank you ladies and gents.

- England

[Weasel]

Map cooling is the coolant thermostat... it is electrically controlled as well for greater engine temp control. That is just a simple thermostat change you can do the same time as the cam sensor.

The adaptive mixture limit reached is a lean mixture problem caused by unmetered air/vacuum leaks. Could be the crankcase vent hoses at the rear of the manifold, could be the manifold agskets old/leaking, etc.

[993turbo]

Originally Posted by Engz

GURUs needed!


Now these 2 last codes I couldn't figure out.

3) 028 Additive mixture adaptation, bank 1, control limit reached

4) 029 Additive mixture adaptation, bank 2, control limit reached.

I have the same codes, and I am fiddling trying to figure out whats wrong...

Let me know what you find out!

[Engz]

Originally Posted by Weasel

Map cooling is the coolant thermostat... it is electrically controlled as well for greater engine temp control. That is just a simple thermostat change you can do the same time as the cam sensor.

The adaptive mixture limit reached is a lean mixture problem caused by unmetered air/vacuum leaks. Could be the crankcase vent hoses at the rear of the manifold, could be the manifold agskets old/leaking, etc.

Thanks Weasel. Ill defintiely check in on those. The first two sounds like an easy fix but the last 2 codes seems difficult and needs to have more look into it.

[Insinoori]

Hello Engz, 993turbo,

did you eventually find any leaks from intake, or what was the reason for the codes?

I have now had SES light three times, first was just cancelled by my Indy shop, and they told me to ignore until (if) the light would show up again.

The second time it was those "adaptive mixture level reached, etc.." -codes, again just cancelled by Indy and they said that not to worry, it was oxygen sensor malfunction.

However I don´t think this would show up on both banks simultaneously?
Any other faults I should be looking into than air leaks in intake?

[Weasel]

Those codes are NOT O2 sensor malfunction, yet the O2 sensors telling you that what they are measuring is not within range. It would help alot to know whether it was mixture too lean or mixture too rich, but aftermarket scanners do not give you all the viable info for these problems.

If I had to guess I'd say it is most likely mixture too lean, which is caused by unmetered air. (ie: vacuum leaks)

What year X5, which engine do you have, how many miles?

[Insinoori]

I have y2000, 4,4l and meter shows less than 70k miles, however I cannot say 100% sure if that is real deal or not.

Last time I checked under bonnet, there was something done (I believe heater wires added) to the oil separator vent hoses (no.4 & 5 here;http://www.realoem.com/bmw/diagrams/t/x/61.png), so that´s where I´ll look into first.

However, I would not like to remove whole intake manifold, if not necessary, so any tricks to check if there´s a gasket leak, without removing the manifold?

[Weasel]

If the indy shop has a smoke tester that is the easiest way. Just hook it up to the breather line that goes to the cyclone valve from the valve cover, plug the hole in the valve cover, and emrove the airbox and plug the intake where the mass air meter was. That tests the whole system including the intake boot, breather valve, intake gaskets, crankcase, etc.

[Insinoori]

Ok, will have to test that as well, sounds like a good test since there´s so many bits and pieces checked at the same go.

Any recommendation for "smokepressure"?

BTW, this is by far one of the best automotive forums I have run into, very good info and great quality threads! Keep up with the good work, and there are many threads which would make excellent "How-to" -articles as well!

[Weasel]

The smoke testers have a set low pressure output, so there is no adjustment needed there.

This is the unit my shop has and it works great.