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Check engine light? EGR valve stuck?

Tiny
DIVIDES
  • MEMBER
  • 2011 BMW 335
  • 6 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 119,000 MILES
This is the 335d diesel model. Drives excellent except when the light comes on and reduces power. Delete the code and it drives great for another 20-25 miles. The pending codes are in pictures. But when I deleted all the only one that was stored was the one that is alone.
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Wednesday, April 27th, 2022 AT 1:11 PM

14 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
I would fix the first codes and then erase the last code to see if it comes back. The first two codes have to do with the EGR valve stuck open. Here is the location and a video to show you how to check it to confirm the failure. The EGR on your car is electronic so you won't need to work the vacuum diagram like in the video, but you should be able to pour liquid into the valve and it shouldn't leak into the auxiliary port.

https://youtu.be/DqUCbbKdWf4

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Thursday, April 28th, 2022 AT 9:23 AM
Tiny
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  • 898 POSTS
So remove it and pour liquid in it and see if it comes out of the other side?
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Thursday, April 28th, 2022 AT 10:29 AM
Tiny
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Removed it, all build up, cleaned throttle and EGR and made sure it moves in and out.
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Thursday, April 28th, 2022 AT 4:22 PM
Tiny
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  • 898 POSTS
Here are some pictures. Hopefully it doesn't have intake valve build up.
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Thursday, April 28th, 2022 AT 4:31 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
Thanks for the images! you can see the buildup of carbon I would clean that off the best you can. This guide can help. I know it's a throttle bore but the process is the same.

https://www.2carpros.com/articles/throttle-actuator-service

Please let us know what happens, Ken
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Thursday, April 28th, 2022 AT 6:42 PM
Tiny
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  • 898 POSTS
Yes, I cleaned all of that. One thing I want to ask. The throttle plate is stopped halfway open, not fully closed like most throttles I have seen. Not sure if this is normal. The first picture I sent earlier shows how it is when installed. I am not opening it with a screwdriver.
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Thursday, April 28th, 2022 AT 7:10 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
This is not normal the bore should close all the way.
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Thursday, April 28th, 2022 AT 8:07 PM
Tiny
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It does close when I push it but pushes right back.
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Thursday, April 28th, 2022 AT 8:13 PM
Tiny
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  • 898 POSTS
Just looked at used and new ones online and they all are open half way.
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Thursday, April 28th, 2022 AT 8:15 PM
Tiny
KEN L
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Okay, that is fine then, please clean it up and make sure the passages are clear as well both on the valve on where it mounts.
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Friday, April 29th, 2022 AT 9:15 AM
Tiny
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Cleaned everything and put it together. The air filter was also dirty and had lots of leaves, cleaned that, and cleaned MAF sensor. Will see if any codes come back and report back to you. Thanks
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Friday, April 29th, 2022 AT 4:02 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
Nice work, we are here to help, please use 2CarPros anytime.
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Monday, May 2nd, 2022 AT 2:12 PM
Tiny
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  • MEMBER
  • 898 POSTS
No more ERG codes but you drive it 7 miles and reduced power check engine light comes on. So, I deleted it and drives normally, MAF code, how do I test the MAF harness?
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Sunday, May 8th, 2022 AT 12:16 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Okay, lets start a new question for this problem. Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Monday, May 9th, 2022 AT 10:30 AM

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