2002 audi a4 1.8t quattro replaced fan relay car wont start

40

Asked by Jun 16, 2017 at 09:59 AM about the 2002 Audi A4 4 Dr 1.8T quattro Turbo AWD Sedan

Question type: Maintenance & Repair

2002 audi a4 1.8t quattro 5 speed, 1st the fan relay was staying on and draining my battery i replaced the relay and spray wire dry on the connection cause water was in where ecu is and now car wont start.

11 Answers

68,255

If water reached the ECU it is more than likely damaged it,

40

No it didnt as it was draining into car, car ran prior, just that fan relay would go on after i was parked and drain battery i replaced it and sprayed wire dry on the connection

1 of 1 people found this helpful.
68,255

After battery drain has it cranked since?

68,255

Low voltage will cause havoc on the ECM,cuaseing it to loose memory of your chip key,if this is your issue a dealer will have to reset the ecm and program the key back to it.

40

No battery issue car cranks, no issue with key also

1 of 1 people found this helpful.
68,255

If engine is turning,and doe,s not run,what i meant was the fan running battery down causing low voltage will cause ECM shortage,loosing memory to your key,this will not kill fire to the engine but will kill the fuel to it,to check what i said,check the fuel pressure,this will let you know.

40

Ah, ok how do i check fuel pressure.

1 of 1 people found this helpful.
68,255

You can rent a fuel pressure guage from most part,s store,s,hook it to the fuel rail cap at the fuel rail ,turn key and crank car over a few time,s,it will give you a pressure,if no pressure then the issue will be what i said.

40

Thank you.. but i didnt have a starting issue until i changed the relay and the fuel pump is new actually had that installed last week

1 of 1 people found this helpful.
68,255

Have you checked your main fuse,s?Main/ecm,etc

40

ah what fuse would be the main fuse please.

Your Answer

A4

Looking for a Used A4 in your area?

CarGurus has 606 nationwide A4 listings starting at $1,895.

Postal Code:

Audi A4 Experts

  • #1
    Deathjam4
    Reputation
    3,640
  • #2
    lukeyramone
    Reputation
    560
  • #3
    Tom Demyan
    Reputation
    470
View All

Related Models For Sale

Used BMW 3 Series
145 Great Deals out of 1,812 listings starting at $2,616
Used Audi A6
126 listings starting at $5,995
Used Audi S4
7 Great Deals out of 131 listings starting at $9,495
Used Mercedes-Benz C-Class
121 Great Deals out of 1,478 listings starting at $3,500
Used Audi A3
15 Great Deals out of 145 listings starting at $4,295
Used BMW 5 Series
25 Great Deals out of 499 listings starting at $2,550
Used Honda Accord
81 Great Deals out of 1,074 listings starting at $1,200
Used Ford Mustang
9 Great Deals out of 1,138 listings starting at $1,250
Used Chevrolet Camaro
759 listings starting at $12,995
Used Audi A8
35 listings starting at $7,995
Used Mercedes-Benz E-Class
48 Great Deals out of 505 listings starting at $3,900

Used Cars For Sale

2018 Audi A4 For Sale
27 listings starting at $48,740
2017 Audi A4 For Sale
8 Great Deals out of 88 listings starting at $37,595
2016 Audi A4 For Sale
4 Great Deals out of 22 listings starting at $27,994
2015 Audi A4 For Sale
3 Great Deals out of 35 listings starting at $25,949
2014 Audi A4 For Sale
3 Great Deals out of 62 listings starting at $17,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.