Location and removal video for ECU Module for 03 vw passat

SOURCE: 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.

SOURCE: Broken hood latch on a 03 Volks Wagon Passat

use a long flat tip screw driver and a small hammer. have someone pull up on the hood after you pop it from the inside, then while they are holding the hood up use the screw driver and shove the hook that is above the latch bar. when you hit it you will be hitting it to the right

SOURCE: Where is the camshaft position sensor located in a 2001 VW Passat

when you are looking at the engine pull off the plastic cover on top then the front cover that covers you timing belt there is a wire harness tha goes right to it in the left upper coner two ten mil bolts and it comes off careful not to drop bolts down in belt that could be bad. it is that easy

SOURCE: VW PASSAT 03 V6. EPC AND TRACTION LIGHT COME ON INTERMITTANTLY.

First, to read VW codes you will want to get yourself a $50 VAG tool. It will read all your systems, not just the ECU.
Electronic Power Control can go out for several reasons. Check your brake lights with the car running. Check you radiator fluid level. If the car is running bad, you could have bad spark plugs/ wires or ignition coil.
The traction control is tied into the ABS system and often causes problems here as well. Each wheel has a speed sensor and magnet wheel in the hub. You can check these for damage by removing the tires for access. The sensors come out by hand, and inside the hole they come out of is the place to check the magnets with a flash light. Apply a small amount of wheel bearing grease to the sensor.
The control unit goes out in these systems at an alarming rate. They can be easily removed, and repaired for under $200 at modulemaster.com
Since it is intermit, I suspect most likely a loose sensor, or electrical connector.
If your brakes feel squishy at all, bleed the brake lines of air and contaminants.
Good Luck!

SOURCE: Replacing the ECU on a 1999 VW Passat Sedan 1.8 Turbo

if u have an electronic key than security codes from ur key must be programmed into the ecu to match-- most ecu change overs on cars usually require a trip to the dealer so they can install their programming most auto shops dont have the funds to, or customer base to spend thousands [every auto maker has their own software and update and change every year]-- every year on reprogramming software for ecu-- they may do only 1 or 2 a year