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Old 01-06-2012, 09:17 AM   #16
Dinanstu
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Sounds like your situation...
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Old 01-08-2012, 06:15 PM   #17
SamE30e
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Quote:
Originally Posted by duaux View Post
Update:
Bad news... the light came back on.

My Research:
1. Drove into Partsource and had them run a OBD-II scan. (FYI - it is free)
2. Checked the code: P1553
3. BMW FC Code: 2A99 [Engine Position System 'B' Performance (Bank1)]
4. Searched the internet... seems to be related to the following...
a) Camshaft Sensors (2x in total for E90, intake and exhaust)
b) VANOS Solenoids (2x in total for E90, intake and exhaust)

Now, from what I am reading, "dirty" VANOS Solenoids can cause fault codes for the Camshaft Sensors. It was noted from BMW bulletin that it should be clean using "air hose" and then reinstall. Other users on the internet seem to be confirming similar treatment when they brought it into the dealer.

My Approach:
1. Take the cheap route first... I will try and clean the solenoids this Saturday. Hopefully that would fix it.
2. ???

Good news is... the parts are not too expensive and it looks like a DIY'er.

I will update for those interested.


Vano's solenoids are a common issue on N5x engines. Not hard to do. If you're going to do it yourself, you may need to pull the rad fan. It's easy, 2 screws and a plug, just takes some wrestling. But you do need to perform a procedure to flush them, which needs a BMW tester.
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Old 01-08-2012, 09:43 PM   #18
duaux
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Update:

1. I took out the VANOS solenoids and "cleaned" them via blowing compressed air into the holes and around. Wiped down cleanly with a shop towel (blue).

2. Swapped the Intake and Exhaust solenoids as recommended for troubleshooting reason. e.g., see if the code scan shows a switch in position. My code P1553 which is BMW FC 2A99 seems to indicate an exhaust VANOS solenoid issue.

3. I fired up the car right after the swap and viola, NO check engine light!

4. I did an OBD-II scan again, but it still shows the same trouble P-code of P1553. I could not clear it. My guess, it may require a "special" BMW code scanner to clean it? not sure. Good news is, there was no new code. e.g., IF I got P1554 which will indicate that the bad VANOS solenoid was indeed the case indicating now an intake solenoid issue.

5. Since Friday night, I have driven about 250km+ ... so far so good. Fingers crossed.

Since the CEL did not come back on immediately after I cleaned the VANOS solenoid, I am quite confident they are related. So, if it does come back on, I will most likely just buy new ones to replace it...

Last edited by duaux; 01-08-2012 at 09:45 PM.
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Old 01-09-2012, 07:41 PM   #19
SamE30e
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Good to hear it worked out..

But you should know that they will cause an issue again in the future.
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Old 01-10-2012, 09:01 AM   #20
duaux
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Yeah... from what I am reading around on other forms, more specifically e90post, many are getting the same issue. If it comes up again, I will try the "popular" method of soaking in a cleaner of choice (e.g., gasoline, diesel, and even brake fluid were mentioned).

If that fails as well, then I will buy new solenoids (which are not too expensive).
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