Audi A6 1998-2004, S6 2002 and later, allroad 2001 and later, rs6 2003 and later (C5)
P0171 - P0174 - P0300
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Replies:
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Last Post:
Jan 26, 2010 10:55 PM
Last Post By: Ginga
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Posts:
22
Registered:
11/09/05
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P0171 - P0174 - P0300
Posted:
Jan 14, 2010 5:07 PM
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P0171 - P0174 - P0300
Hello, i get these codes when I scan the ECU
171 & 174 right and left bank low density
300 random misfires
the only two things i can think of which changed recently in the car configuration are that I added a small quantity of fuel additive (Lucas) to clean the injectors and fuel system, or there is an issue with the APR ECU upgrade stage 1 (318hp chipped with 93 octane). However I get the codes when the program is running stock mode...
I also replaced the sparkplugs with NGK but i don't this has anything to do with 171 and 174
any clues?
Thanks in advance!
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Posts:
22
Registered:
11/09/05
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Re: P0171 - P0174 - P0300
Posted:
Jan 14, 2010 5:09 PM
in response to: Ginga
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i should add this is for a stock Allroad 2001, 2.7tt Tip
(APR ECU is the only non-stock item)
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Posts:
1,409
Registered:
12/09/03
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Re: P0171 - P0174 - P0300
Posted:
Jan 18, 2010 11:52 PM
in response to: Ginga
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Based on VAG's history, I'd guess its a bad MAF sensor. I've replaced a few on 2.7 engines. It has to be something that affects both sides of the engine, so a vacuum leak isn't likely but it could be a bad connection on the inlet hose between the maf and the throttle. For it to be a vac leak it would need to be a large one, like from the brake booster hose. If the car is running too lean that can also be the cause of your misfire code. With a generic level scanner its going to be hard to be certain. Indy shop in your area? They may have a smoke machine so they can check for leaks too.
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Posts:
22
Registered:
11/09/05
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Re: P0171 - P0174 - P0300
Posted:
Jan 23, 2010 3:42 PM
in response to: budpalumbo
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i have just ordered a vag-com hex-can from RossTech. SHould get it on Monday. In the meantime I got a used MAF from a scraped 2002 allroad at a scrapyard (hit in the rear so the front + engine was working good). I got it really cheap so I'l swap the MAF this weekend and see if that solves my problem. I checked hoses, replaced some clamps, and also replugged the small hose going into the left turbo that was disconnected somehow after i replaced the left engine mount. Not sure if this has done anything yet since the MIL is still on (and will be for a few more cycles). I dont want to clear the codes yet since if what i have done so far did not do anything then when i get the vag-com interface i'll be able to post more details here. Cheers,
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Posts:
22
Registered:
11/09/05
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Re: P0171 - P0174 - P0300
Posted:
Jan 26, 2010 10:55 PM
in response to: Ginga
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with vag-com i get 10 faults with the engine block codes
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16685 - Cylinder 1: Misfire Detected
P0301 - 35-00 - -
16687 - Cylinder 3: Misfire Detected
P0303 - 35-00 - -
16686 - Cylinder 2: Misfire Detected
P0302 - 35-00 - -
17536 - Fuel Trim; Bank 1 (Mult): System too Lean
P1128 - 35-00 - -
17538 - Fuel Trim; Bank 2 (Mult): System too Lean
P1130 - 35-00 - -
17862 - Exhaust Gas Temp Sensor 1 (G235): Short to Ground
P1454 - 35-10 - - - Intermittent
16688 - Cylinder 4: Misfire Detected
P0304 - 35-00 - -
16690 - Cylinder 6: Misfire Detected
P0306 - 35-00 - -
16689 - Cylinder 5: Misfire Detected
P0305 - 35-00 - -
when I read blocks 32-33 i get 25% (max in range) on both trims/sides...
i have not replaced the MAF yet but based on your experience does this point to a MAF issue?
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