Great DIY Thanks aloot

 

awesome! thanx

 

Awesome!!! That will save someone $30-40

 

Looks like ECS Tuning sells the unit for $46.

 

THAT'S what THAT is! Had no idea.

Thanks for this OP, off to check it out.

 

nice DIY! i'm going to do this now.

 

Perfect! I've been having the AUC code popping up.

 

Awesome. I just got the auc short circuit to ground error, seems it has triggered 9 times in the past. My sensor in the box is positioned differently, yours look like it is perpendicular to the filter, mine is parallel. However not sure if cleaning it will resolve the error, but def worth a shot. Thanks.

 

good info that one! in my scanner 1.4 that sensor appear in red and i was going to buy a new one but now that i know hot to clean it i hope i works better thanks!

 

Alright i open my sensor it was empty inside i went to a local home-deport and i bought some filter similar to OEM but my sensor is still in red on the scanner! What to do know?

 

AWESOME! I have always wondered how in the hell the auto-circulation function knows when the air is dirty/smelly. Would be great to get confirmation of the actual filter material.

 

I'm gonna do this tomorrow!

 

So THAT'S why that connector is so big!

And now I know how it works! Thank you!

 

thanks for the info. gonna do this soon :thumbup:

 

I saw this sensor in the schematics, but had no idea where it was. Good info! I would never have attempted to open that box, without knowing what was inside. I have learned that lesson the hard way...

Edit: I just noticed the OP has not been on here for almost a year. He may not even have an e46 at this point.

 

Interesting thread, but, I question the need to replace the filter. The sensor is a Figaro TGS 822 which is for sensing Organic Solvent Vapors. Here is the data sheet
http://www.figarosensor.com/products/822pdf.pdf
This sensor is used to detect chemicals like Acetone, Ethanol, Benzene, n-Hexane, Isobutane and carbon monoxide. A similar detector is used to detect carbon monoxide in home CO detectors (I have some Figaro sensors for detecting CO). The sensors in home CO detectors are only rated for 5 years of use. If you are getting AUC sensor errors in the IHKA module like 28 AUC Sensor-open circuit or 30 AUC Heating-short circuit to ground, I would suggest changing the sensor rather than just changing the filter, which, I don't believe will do anything. The original part number is 64.11-8 391 470 and has been replaced by 64.11-6 917 001. ECS Tuning has the part for $46.84 (as of 4/9/2013)

 

If you're good at soldering, you can get one of those for $11 shipped http://www.aliexpress.com/item/FIGA...O-TGS-822-Gas-Sensor-for-the-detection-of-Organic-Solvent-Vapors/656495742.html

 

Hmm has anyone tried to solder this replacement sensor piece in? anyone confirm it will work?

 

I think its a problem with soldering, because figaro is sealed...

 

thanks, that was the fault code i have....i ll fix it tomorrow.

 

Fix it (replace the $50 sensor) only if you want the automatic air recycle feature. Most people don't understand this feature and don't care. When set to Auto Recirculate the HVAC system will stay in fresh air mode and if the sensor detects large amounts of exhaust fumes in a tunnel for example (you can look up the sensor to find out what gases it is used to detect) it will automatically switch to recirculate. With a bad sensor it won't automatically switch and you'll have to switch manually. The response time of the sensor detecting a cloud of black exhaust from a diesel truck will be too late and you are better off switching manual when you see the cloud.

If your goal is to have zero faults when you scan all the modules in your car then good luck. That is a loosing battle. The mechanics hate it when customers scan their own car and come in complaining about code that comes up after a repair that are totally unrelated. Codes will happen. Don't treat everyone as a problem that needs to be taken care off.

 

fixed it, you were totally right.the filter was like sand inside so i bought the similar filter put inside cleared it...perfect....thank you so much...great DIY

 

Thank you so much!

Maybe I should clean mine soon


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The normal faults that occur when the AUC sensor goes bad are not fixed by replacing the stupid filter. If you have fault codes for the AUC sensor then the sensor needs to be replaced.

 

I just found this sensor under my plastic belly pan as I was unscrewing it and snooping around. It obviously fell off and has been there for a long time. I'm not getting any errors on my dash, I'm just wondering how critical of a part this was. I opened it up to as shown and mine has no batting stuff in it. Just dead air. How critical is this part?

 

I seem to have been doing fine without it

 

Kewl! You learn sumthin' new every day. I thought that box was a relay for the fan motor.

 

It sits above and behind the radiator???? How in the hell does it get fresh air???


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Perhaps the large fan sitting next to it solves that problem.