Question about 1999 Audi A6

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Shuttering / vacuum

1999 Audi A6 Quattro shutters when going up hills. Engine coded mass air flow sensor, will replacing it and throttle vacuum hoses fix my problem ?

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Do you also see the shuddering when you hit the gas to pass someone or accelerate quickly? If so, I'd swap out the fuel filter first - less money and that's a symptom of a clogged fuel filter.

If that doesn't do it, then yeah I'd check the mass air sensor out.

Posted on Jun 01, 2009

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Posted on Jan 02, 2017

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I have p 1121 and a P 0401 codes on my 1998 ford windstar. are these related? what can I check? replaced the mass airflow sensor recently.




P1121 Ford Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
http://engine-codes.com/p0401_ford.html no they are not related !
Are there any cracks in the rubber hose from air cleaner to throttle body ! That could cause the P1121 air entering after mass air flow sensor !
P1121 - Throttle Position (TP) Sensor Inconsistent with MAF Sensor The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.
  • Air leak between MAF sensor and throttle body
  • TP sensor not seated properly
  • Damaged TP sensor
  • Damaged MAF sensor
Drive vehicle and exercise throttle and TP sensor in all gears. A TP PID (TP V PID) less than 4.82 % (0.24 volt) with a LOAD PID greater than 55% or a TP V PID greater than 49.05% (2.44 volts) with a LOAD PID less than 30% indicates a hard fault. P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
  • Vacuum supply
  • EGR valve stuck closed
  • EGR valve leaks vacuum
  • EGR flow path restricted
  • EGRVR circuit shorted to PWR
  • VREF open to D.P.F. EGR sensor
  • D.P.F. EGR sensor downstream hose off or plugged
  • EGRVR circuit open to PCM
  • VPWR open to EGRVR solenoid
  • D.P.F. EGR sensor hoses both off
  • D.P.F. EGR sensor hoses reversed
  • Damaged EGR orifice tube
  • Damaged EGRVR solenoid
  • Damaged PCM
Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents

Mar 09, 2015 | 1998 Ford Windstar

1 Answer

We are replaced engine for 2000 Audi A6 Quattro, check eng was "on", we are replaced Oxigen Sencor and Mass Air Flow Senser, everything was fine, eng, works good, then car seating a while and appeare


p1423 p1411
u either forgot to put the hoses at the air motor or air motor not working.the location is at the passenger side in front of engine behind bumper and right beside the a/c dryier.looks like a blower....
p1227 can not remember......
check light went on when the engine got warm?

Sep 19, 2014 | 2000 Audi A6

1 Answer

2007 kia rio losing power when going up hills


Random misfires could be gas related- low fuel pressure, vacuum leaks or air leaks upsetting the air/fuel mixture ratio, clogged air filter or fuel filter. Could be ignition related- worn spark plugs, possibly. Or could be an internal mechanical problem-possible valve train malfunction.
Start with a fuel pressure test. check vacuum hoses for leaks, check intake manifold and throttle body assembly for leaks. If you have an exhaust leak at or near the engine, can cause misfires. Air going into the engine is metered by the mass air flow sensor in the big air boot on the throttle body. If extra air gets into the engine through a vacuum leak or a loose hose, the engine computer won't know it, so the air/fuel mixture will be too lean, resulting in misfiring. Several things to check-good luck.



Dec 28, 2013 | 2007 Kia Rio 1.6

1 Answer

Audi a4 56plate . when putting the thruttle down the car shutters, hesitates


Try unplugging the Mass Airflow sensor and see if the car runs better, if it does replace the MAF sensor. It is located in the air intake hose to the engine.

Feb 16, 2012 | Audi A4 Cars & Trucks

1 Answer

The check engine light is on and the code is narrow passage in EGR. Would like step by step for checking valve and removing and cleaning if possible. 1996 A6 Quattro Avant


Disconnect first the vacuum line from the EGR valve. Connect a hose to the EGR and cover it or **** on the hose.

IF the engine stumbles the passages are ok, you may just want to check the vacuum lines or the sensors itself. Otherwise try cleaning the EGR with cleaning spray before replacing.

May 05, 2011 | 1996 Audi A6

1 Answer

Whats the best way to find a vaccum leak ? its a2000 audi a6 4.2 , just had tune up and mass air sensor replaced and the engine lght is still on.


get a can of carburetor cleaner, spray around vacuum hoses, when the sray hits a leak the engine might rev up a little

Feb 20, 2010 | 2000 Audi A6

1 Answer

1998 A-6 quattro 2.8L V6 (AHA) I have two codes coming up PO432; states, main catalyst efficiency below threshold (bank2) PO441; states, Evaporation Emission system incorrect purge flow. The car runs...


PO432= 1 OF THE SENSOR IN THE EXHAUST SYSTEM if u stand in front of engine to your rt under the car should be a oxygen sensor just unplug it and put a new one.....(bank2)
PO441 = Evaporative Purge Flow Monitor check your fuel cap and replace all of your vacuum hoses because they can be damaged or plugged this should fix it.
So good luck to ya....

Oct 14, 2009 | 1998 Audi A6

1 Answer

Powerloss problem


could be the sensors under the dash on the pedals ,this is not a diy job but i would recomend dealer only

May 28, 2009 | 2000 Audi A6

1 Answer

Code 16795


http://wiki.ross-tech.com/index.php/16795/P0411/001041
Check this site for any Audi codes. This is a problem with the air that it injected into the exhaust system to help burn any uncombusted fuel. Check the air pump located in front of the pass front wheel on the bottom of the engine. It is pretty easy to find. The air pump has a suction hose that goes to the air filter housing so that it has filtered (clean) air, follow the hose

Dec 08, 2008 | 1999 Audi A6

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