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Where is ecu on 2003 passat? - 1991 Honda Accord

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Changed car battery now esp light on constantly.Passat 2003 TDI


The code needs to be read first.Sounds like the steering angle sensor needs to be reprogrammed with requires high end scan tool. Sometimes driving the car helps the ecu to relearn steering angle sensor.

Mar 06, 2017 | 2003 Volkswagen Passat

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I have a vw passat TDI130 2003. It runs really well, but engine workshop lights up along with the esp, abs and the glow plug indicators lighting up, most garages are charging just for a diagnosis to the...


Check & replace if necessary the brake pedal switch placed above pedals on the support.
If the problem still occurs you might access the ESP & ABS ECU (Electronic Control Unit) using diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC (Diagnostic Trouble Codes) memored.
Then you will be able to replace bad piece(s) and fix the problem by erasing all DTC stocked inside ESP & ABS ECU & reset it.
I'm convinced that your brake pedal switch is faulty because the glow plug warning light went ON, along with the ESP & ABS. Just replace the brake pedal switch, see if rear stop lamps light when press the brake pedal, and test the car on the road.

May 20, 2011 | 2003 Volkswagen Passat

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The esp light went on first and then the glow plug warning sign on my 2005 TDi passat. said workshop assistance, what is the problem


Check & replace if necessary the brake pedal switch placed above pedals on the support.
If the problem still occurs you might access the ABS & ESP ECU (Electronic Control Unit) using diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC (Diagnostic Trouble Codes) memored.
Then you will be able to replace bad piece(s) and fix the problem by erasing all DTC stocked inside ABS ECU & reset it.
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The ESP system means the Electronic Stability Program. If the ESP lights on the dashboard permanently the ESP system is faulty. You must access the ESP Electronic Control Unit (ECU) memory for pull out all DTC (Diagnostic Trouble Codes), using diagnostic equipment connected to the data link connector of the car. Then you will be full informed about bad pieces (e.g.: brake pedal switch, front right wheel abs sensor interrupted, ...). After bad pieces replacement you will be able to erase all faults memored by ESP ECU, in other words reset the ESP system and turn off the warning lamp on dashboard.
I'm convinced that your brake pedal switch is faulty because the glow plug warning sign went ON after ESP warning light. Just replace the brake pedal switch, see if rear stop lamps light when press the brake pedal, and test the car on the road.
Good Luck!

May 11, 2011 | 2003 Volkswagen Passat

1 Answer

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

Mar 01, 2010 | 1999 Volkswagen Passat

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Hi I have a 2003 vw Passat 1.8t and I need to find the tempcontrol sender . can you help?


If it's the outside air tempreture sensor its under the centre of the front bumper area and visible from underneath with the large plastic undertray removed, the water temreture sensors are on the firewall above the oil filter, there are 2 and one is for the ecu and one the dash tempreture.

Feb 07, 2010 | 2003 Volkswagen Passat

1 Answer

Passat code p02181


How old is the Coolant Temperature Sensor (CTS)? The CTS have been know to fail, don't rule it out. After that, there's the thermostat and possible water pump. The pump would be your last choice since you did not say it was over heating and the effort required to replacing it. Go with the sensor first, it is a 2 part sensor, and apparently the half sending signal to ECU isn't working correctly according to the ECU.

Replaced the sensor ($43 from my local VW dealer: ouch.) Once you the parts in hand, and the engine was cool enough, it takes all of two minutes (less time than it takes you to replace one of the windshield wiper's rubber; who designed that damn thing????). Then replace the Thermostat 190F and cleared the check engine light.

Good luck and this should solve your P2181 Issues.

Oct 31, 2009 | 2003 Volkswagen Passat

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Central locking and electric windows not working


there is a ECU under the carpet on the passneager side ( right hand drive) check ecu for damage( maybe change) check the wires going to the ecu for brecks as well

May 11, 2009 | 1999 Volkswagen Passat

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