Question about 1993 Volkswagen Passat

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Passat 2001/2003 I have passat 2. the problem (too lean fuel)

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  • yasir4518 Jul 29, 2008

    ihave the prblem on passat 2. engine troble code 16555 b1 fuel system too lean pls re - anser

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Please see http://www.justanswer.com/questions/1ifay-used-obd-tester-2002-vw-passat-4

Posted on Dec 20, 2008

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There may be some block in the fuel pump so try to clean the fuel pump and after tat u will be having correct fuel flow

Posted on Jul 28, 2008

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Engine light flashing and engine running very rough


HAVE VECHICLE CODE SCAN AT ANY AUTO PARTS FOR FREE SOUND LIKE FAULTY EGR VALVE.SEVERE CYLINDER MISFIRE BAD SPARK PLUGS OR BAD COILS. COULD HAVE LEAN FUEL MISFIRE CLOGGED FUEL FILTER WEAK FUEL PUMP, FAULTY MASS AIR FLOW SENSOR.

Aug 19, 2011 | 2003 Volkswagen Passat

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I have a 2006 VW Passat 2.0T. My check Engine light is on and when it was scanned I got two codes 171 & 455. What does this mean? I do notice that when I fill up at the gas station, my car acts like it...


Engine is running lean and there is a leak in the evap system, most likely due to purge valve stuck open. This is causing the engine to flood after a fill up. This is a known problem with the 06 Passat. See post here: http://consumerguideauto.howstuffworks.com/2006-to-2010-volkswagen-passat-2.htm

Nov 27, 2010 | 2002 Volkswagen Passat

1 Answer

BOTH O2 SENCERS HAVE BEEN REPLACED STILL THOWS PO 171 CODE CHECKED FUEL PRESSURE AND FOR VACUM LEAKS SAME CODE


That is a lean code. Most commonly it is a vacuum leak, you're right. Are you sure there is no leak? Maybe one you haven't yet found? Possibly an intake leak?

You can also look into Fuel pressure regulator, fuel injectors, and even an exhaust leak can all be culprits but I say you should keep looking for the vacuum leak.

Sep 23, 2010 | 2001 Volkswagen Passat

1 Answer

What does it mean to "fuel trim too lean" and "valve cover cracked at the oil fill neck"?


It means vacuum leak, with valve cover crack, that will give you a lean problem, replace valve cover and clear codes.Should be good to go.

Aug 19, 2010 | 2006 Volkswagen Passat

1 Answer

Have this code PO171, what does this mean.


Not sure that the O2 sensor was bad. It sounds like it was telling you that side of the exhaust system was picking up a lean mixure at the O2 sensor. The O2 sensor was doing its job by telling you the mixture changed. If the O2 sensor was bad, it would say low voltage range for that sensor, or open curcuit.
Now the car has had time to do its diagnostic sweep, it is telling you the same thing, but from a different sensor...the fuel mix is too lean. Air/spark/and fuel is what you need in the correct amounts. In your car, the ECM engine control module controls this by taking readings from all the sensors several hundred times a second.
Mechanically, you have a few options. Change the fuel filter...under the car on the passenger side. It is an easy job.
Change the fuel pressure regulator. This keeps the fuel at 4 BAR so the fuel injectors can do their job correctly. This job just needs a screw driver to pop off the clip that holds it in place. No hoses need to be removed. It is on top of the intake manifold, in-line with a metal fuel line and a rubber one.
The fuel injectors could be clogged up on one side of the engine. Run some fuel injector cleaner through a tank of gas. Also, listen for a constant ticking sound at each injector. If one sounds off PAR, then replace it.
The fuel pump may not be giving you enough power. However, the readings seem to be localized to one side, so I doubt it.
Start with the easiest thing, and see if it works. Also, you will need to get yourself a VAG scan tool. It is the only one with codes in it for all of your VW systems, not just engine codes like the ODB scanners. You can get a nice one for $50 on-line.
Good Luck!

Feb 24, 2010 | 2002 Volkswagen Passat

1 Answer

I am getting a p0171 code on my 2005 volkswagon passat what does that mean


P0171 - Fuel Trim, Bank1 System too Lean
VW DTC 16555 (P0171) - Fuel Trim, Bank1 System too Lean
By only pulling battery power from the ECU doesn't clear the codes on OBDII systems.
You must have access to a VAS, VAG-COM, Bosch KTS, ... diagnostic scantool. The ECU (Electronic Control Unit for engine management) is seeing a fuel trim that's much too lean even with the ECU making adjustments. Colud be the MAF (Mass Air Flow) sender out of order, the pre-cat O2 sensor, or a significant vacuum leak. You need to confirm / deny working parts with a 2nd gear pull data-logging measuring blocks 002, + 032 (VAS, VAG-COM).

Dec 09, 2009 | 2005 Volkswagen Passat

1 Answer

I have a vw passat 2001 2.0s petrol which has developed a fault. the engine management light came on some 3 weeks ago and since then the dealer has fitted a new cat and replaced some oil breather pipes but...


vaccum leaks cause this type of misfire . this sometimes happens when someone works on car and does not tighten hoses also could be low fuel pressure or lean fuel caused by air to fuel ratio. i would try vaccum first

Oct 20, 2009 | 2003 Volkswagen Passat

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