air flow meter warning - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 12-09-2007, 08:47 AM Thread Starter
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air flow meter warning

hi! the computer diagnosis says " air flow mass error" ...but the car looks ok.only the engine warning light is on...is that possible? the car is a c200 compressor 2002 model.thanks!!!

Last edited by mariosg76; 12-09-2007 at 11:32 AM.
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post #2 of 6 (permalink) Old 12-09-2007, 12:09 PM
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The CEL can come on for dozens of reasons, even if the code show MAF malfunction. Chances are you can drive w/ the CEL on for a long time and have no noticeable problems. But if it is a bad MAF your gas mileage and some other things can suffer. I would have your dealer check it out and fix it for you, though I doubt that there is any urgency. Here are a couple articles that might be of interest:

Check Engine Light

http://www.x-desk.net/ximages/21302_pgsi0079en.pdf

mass flow sensor: Information and Much More from Answers.com

Don't believe everything you think
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post #3 of 6 (permalink) Old 12-09-2007, 05:14 PM
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If the codes were P0170 and P0173, there is a chance you can remove the MAF insert and clean it with CRC Mass Air Flow Sensor Cleaner. Hopefully this is available where you are. If you do a search, you will find numerous descriptions of how to do this.

Mike
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post #4 of 6 (permalink) Old 12-21-2007, 12:28 PM
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Quote:
Originally Posted by mariosg76 View Post
hi! the computer diagnosis says " air flow mass error" ...but the car looks ok.only the engine warning light is on...is that possible? the car is a c200 compressor 2002 model.thanks!!!
Hi,

I also had a 0170 and 0173 Fault code. I have a C180. Here is how I fixed it.

1. If the car is in good order (recently serviced)

1. Check for leaks in the air intake system (Air filter box, mass air flow sensor, ducting from air filter box to throttle assembly.) a loose hose clip or split for example. This is an important step as a leak can cause these codes.

If all looks good and there are no leaks.

2. Remove the mass air flow sensor and clean the sensor suspended in the middle of the tube with an aerosol can of IPA. Repeat 3 times. Allow to dry. Do not use compressed air to speed the drying process.

3. Refit the clean mass air flow sensor.

4. Allow 3 days worth of normal driving to allow ECU to get used to having a working mass air flow sensor.

5. Recheck your fault codes and all should be cleared. If not recheck for leaks.

This has proven to be a long term fix to my car.

At the time I was considering a new mass air flow sensor so had nothing to loose in attempting the cleaning process described above. Some people use switch or contact cleaner or a "special mass air flow cleaner" both of which are manly IPA but also contain other solvents which may not be as safe to the delicate sensor as IPA only. I know this from 20 years worth of expirience with solvents and delicate electronics.

I hope this clears up any confusion, good luck with your fault.

I am now in a position to update my cleaning notes, My MAF has finally failed, I can therefore conclude that in my case cleaning the MAF only kept it going for a further 3 months until my fault symptoms returned. I replaced mine and saw my fault symptoms ( would not idle when cold, lumpy aceleration, misfires) clear instantly.

In conclusion cleaning is a short term fix (upto a few months)

Last edited by mercmerlin; 03-13-2008 at 02:24 PM. Reason: update
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post #5 of 6 (permalink) Old 12-21-2007, 06:45 PM
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Originally Posted by mercmerlin View Post
H
4. Allow 3 days worth of normal driving to allow ECU to get used to having a working mass air flow sensor.
.
No 3 days necessary. Before I bought scanner, clearing CEL took me 10 seconds/7 restarts.
But I had good MAF, not cleaned one.
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post #6 of 6 (permalink) Old 12-22-2007, 05:23 PM
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Quote:
Originally Posted by mariosg76 View Post
hi! the computer diagnosis says " air flow mass error" ...but the car looks ok.only the engine warning light is on...is that possible? the car is a c200 compressor 2002 model.thanks!!!

Don't let the dealer conn you into buying a new one, they run around $300 - $500 depending on your model. Its cheaper to clean it first, 9 times out of ten it just needs to be cleaned. Good luck, keeps us posted
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