P0012 and P0015 codes

[master4200]

I'm a fairly new owner to a 2006 BMW 325i. I changed the oil and the oil filter when I first got the car about 6 weeks ago but I put 5W-30 Quaker State fully synthetic oil not realizing the specs for BMW oil. About a day or two after I had the oil changed, I got p0012 code with the yellow check engine light. The check engine light stayed for about a day then disappeared for a day or so and then came back. So I did some research and found 0that it's most likely the vanos solenoids that caused it. So I cleaned the solenoids and put them back in. The check engine light went off for about 5 days then came back on. So I thought the solenoids need replacing. I changed the oil and oil filter to BMW OEM and replaced the solenoids with those solenoids:
http://www.ebay.ca/itm/221962086471?...%3AMEBIDX%3AIT

The check engine light was off when changed the oil and replaced the solenoids and it stayed off for about a week. Now it came back on and this time it's showing P0012 and P0015 codes. Has anyone been in this situation before? Any ideas what might be causing them?

[MarcoZandrini]

You have to remember that codes are SYMPTOMS, and not solutions. Throwing parts at a problem doesn't fix the problem, wastes money and angers the BMW goddesses. Please remove the aftermarket parts and replace them with the perfectly good BMW parts. Then, find s reputable independent shop that specializes in BMWs.

[master4200]

I followed your advice and replaced those aftermarket solenoids with ones I purchased from the dealer and the check engine light turned off immediately and the car seems to run smoother. I'm hoping that solved it!
Thank you for the advice!