Question about Volkswagen Passat

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I can't read the obd plug from my VW passat 3B2 by 1999. I need to know what volts i'm supposed to read in the plug from 1 to 16. I already found that I had an aftermarket radio but still no connection...? plz help

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Two of the wires in the plug should have battery voltage, one when the ignition key is turned to run or accessory position (radio B+ power) and one is hot all the time (keep alive B+ memory power)

Posted on Mar 16, 2011

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How do I check the codes on a 2004 VW Passat?


YOU NEED A OBD 2 CODE SCANNER.YOU PLUG IT TO DLC TERMINAL UNDER INSTRUMENT PANEL.LOOK FOR 16 PIN DIAGNOSTIC CONNECTOR.THAT WHERE CODE SCANNER PLUGS IN TO.TO SAVE YOU MONEY AUTO ZONE OR ANY AUTO PARTS STORES WILL CODE SCAN YOUR CAR FREE.

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I need to replace the alternator on my 2003 VW passat 6cyl. I took it to a shop that said that VW is there specialty. The price for the labor and alternator almost did me in. just trying to see if I was...


prices of the alternators on line range any where from $150 to$ 380
Labor wise shouldn't take more than 2hr to R&R remove and replace This is a ball park figure

Sep 05, 2010 | 2003 Volkswagen Passat

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Where is plug for scanner


i should probably know this since i used to work at a vw dealer but we didnt do many old passats. i know that the old jettas had it hidden behind a small piece of plastic near the radio/heater controls. 96 and up vehicles are supposed to be obd2 thought, and one law of obd2 vehicles is that the connector must be under the drivers side dash, and visible from the left front corner of the driver seat.

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Chech Engine light on so I plugged in my OBD tool and it read FUEL TRIM TOO RICH AT IDLE(bank 1).What sensor or part needs to be replaced? The vehicle is a 99 VW Passat 4cyl 1.8 turbo.


i would say the up stream o2 sensor.if you had a decent scanner you could watch the readings and know for sure.this is just and educated guess as i do not know those readings.

Jan 26, 2010 | 1999 Volkswagen Passat

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2003 VW Passat OBDII connector


Hi, you have to remove side fuse cover and remove 4 bolts 8mm.Pull foot well cover and secure conector.It may need new housing for OBDII conector.

Mar 05, 2009 | 2003 Volkswagen Passat

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My 2006 VW Passat will not turn over...


the sensor that tells the can bus what position the stick is in is located on the gearbox not on gearstick.you need to know what position that sensor is seeing the only way is with a more advanced diagnostic tool than just a fault reader.i would recomend vw dealer as passat electrical sytems can be a bit of a challenge when they go wrong and a dealer will be best placed to sort it for you.

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Vw passat radio code


Passat 97 need to re-enter code ( 4 ) digit, however it shows the number 2 on the on screen when the radio is turned on.
Help. I need to know the steps to reset. thanks

Dec 13, 2008 | 1999 Volkswagen Passat

2 Answers

1997 VW Passat trouble code


Hi ejj509,

Both my 97 Passat and my wife's 99 Passat were throwing the same OBD codes you listed.

Both VW's had the same problem. There is no "quick" solution for the problem. I can tell you what I found, what I had to do and how I repaired both vehicles so they no longer throw this OBD error code.

I removed the black plastivc AIR pump and found that three of the six aluminum rivets which hold the AIR pump impeller housing together had rotted off so the case was leaking air. I went to a hardware store with one of the aluminum rivets I had removed from the AIR pump and bought six brass machine screws and brass nuts. I gouged the aluminum rivets out and replaced them with the brass machine screws.

After I had replaced the AIR pump in the VW, I cleared the codes and ran the diagnostics again.
It still threw the same codes!!!

Next, I removed the plastic top engine cover from the VW engine (VR6) and located the many air solenoids hidden under the cover. I went to a local NAPA shop and purchased an eight foot length of their smallest gauge neoprene gas line (1/8 inch ID).

I carefully removed each piece of rotted VW vacuum line from the air solenoids and replaced each rotted section with lengths of the new neoprene gas line. I had to follow out each of the old vacuum lines and replace them because they were badly deteriorated. This took about five hours to accomplish.

I replaced the plastic engine cover and connected up my cable from my laptop to the VW's computer port, cleared all of the codes and ran a new scan. This time the scan was clear! Woo Hoo! Apparently, the problem was both the leaking AIR pump and faulty, deteriorated (cheap) Volkswagen vacuum lines.

It was well worth the effort. My driveway has now become a bonafied VW repair shoppe.



Nov 07, 2008 | 1997 Volkswagen Passat

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