Stalls during idle

Asked by Jan 09, 2017 at 11:22 PM about the 2003 Audi A4 1.8T Quattro

Question type: Maintenance & Repair

Hey, could anyone possibly help?
My boyfriend has a 2003 A4 1.8T Quattro. Every
since he got it, he has been having issues with it.
The check engine light was on from the beginning,
and when he would read the code it would say
catalyst below threshold. He replaced the coil
packs, the spark plugs, the timing belt, oil pan, and
got a brand new exhaust with the cat. It ran great
for about a week, and then threw another check
engine light, that read catalyst below threshold. We
took it to an Audi dealer to have them run
diagnostic testing to see if they could find
something that was wrong. They ended up
replacing a sensor (I'm not sure which one) and it
ran like a champ for 3-4 days. Now, the check
engine light is on again. Every time the check
engine light comes on, it will start fine and then after
a max of 5 minutes of idling to warm it up, it will
stall. It loses rpms at first, but it will recover itself so
to speak, but it will eventually stall. It has also
stalled multiple times while driving. We just want
answers, we don't know what to do. The whole
underside of the car is basically brand new..
Thanks for any help in advance!

1 Answer

110,735

There is a throttle body temperature sensor mounted in the top of the intake. check all the vacuum line, spray soapy water and look for bubbles. Make sure the gas tank is always fill above a 1/4 tank. clean your MAF (Mass airflow Sensor) and check the fuel pressure.

Your Answer

Audi A4 Experts

  • #1
    Deathjam4
    Reputation
    3,660
  • #2
    lukeyramone
    Reputation
    560
  • #3
    Tom Demyan
    Reputation
    470
View All

Related Models For Sale

Used BMW 3 Series
1,039 Great Deals out of 33,000 listings starting at $999
Used Audi A6
157 Great Deals out of 6,782 listings starting at $1,995
Used Mercedes-Benz C-Class
678 Great Deals out of 28,104 listings starting at $1,000
Used Audi S4
46 Great Deals out of 1,691 listings starting at $3,500
Used Audi A3
103 Great Deals out of 5,292 listings starting at $3,250
Used BMW 5 Series
471 Great Deals out of 15,884 listings starting at $1,995
Used Honda Accord
1,047 Great Deals out of 56,909 listings starting at $1,099
Used Ford Mustang
595 Great Deals out of 36,129 listings starting at $1,800
Used Audi A8
63 Great Deals out of 2,082 listings starting at $3,950
Used Mercedes-Benz E-Class
588 Great Deals out of 20,231 listings starting at $2,500
Used Volkswagen Jetta
587 Great Deals out of 33,972 listings starting at $1,295
Used Honda Civic
758 Great Deals out of 69,159 listings starting at $1,499

Used Cars For Sale

2018 Audi A4 For Sale
3,891 listings starting at $33,691
2017 Audi A4 For Sale
44 Great Deals out of 1,941 listings starting at $20,000
2016 Audi A4 For Sale
10 Great Deals out of 222 listings starting at $20,988
2015 Audi A4 For Sale
24 Great Deals out of 758 listings starting at $16,939
2014 Audi A4 For Sale
64 Great Deals out of 1,093 listings starting at $13,391

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.