I am looking at a 2006 A4 2.0 Turbo from a private seller. The "check engine" light is on. He says it's the gas cap connection to the computer. Any insight to this?


Asked by Mar 13, 2017 at 10:47 PM about the 2006 Audi S4 quattro Sedan AWD

Question type: Maintenance & Repair

current owner says he has had the check engine light turned off at the dealership several times. He says it's the gas cap connection.  Does anyone have any history or solution to this?  What is the fix?

6 Answers


Something in the EVAP system is wrong. It could be the cap, a hose or the canister. Why didn't the dealer fix it? Too expensive?

3 people found this helpful.
Best Answer Mark helpful

Yeah, he's giving you a song and dance! Find out what trouble codes are showing up. It could be something simple or it could, and probably is, something expensive. Otherwise he'd of gotten it fixed before putting it up for sale!! Let us know what codes you get. Most auto parts stores will scan the computer for free. If the seller balks about letting you scan the computer, walk away!! HTH -Jim

1 people found this helpful.

I am always suspicious of sellers who say "it just needs this one little thing fixed". If it is so easy why didn't they take care of it?

2 people found this helpful.

Thanks all! I will start with the easiest detective work (auto parts store scan for codes), then call the dealership with the Vin # to see what they will share about the car and this on-going issue.

1 people found this helpful.

Carfax too.

2 people found this helpful.

You're welcome. Glad to help. -Jim

Your Answer:


Looking for a Used S4 in your area?

CarGurus has 1,531 nationwide S4 listings starting at $3,200.


Audi S4 Experts

  • #1
  • #2
    Joon Kim
  • #3
View All

Find great deals from top-rated dealersTM


Related Models For Sale

Used Audi A4
271 Great Deals out of 12,241 listings starting at $1,800
Used BMW 3 Series
687 Great Deals out of 24,502 listings starting at $1,750
Used BMW M3
41 Great Deals out of 1,331 listings starting at $6,495
Used Audi S6
23 Great Deals out of 365 listings starting at $5,700
Used Audi A6
210 Great Deals out of 9,461 listings starting at $2,650
Used Audi RS 4
43 listings starting at $14,500
Used Mercedes-Benz C-Class
676 Great Deals out of 22,993 listings starting at $900
Used Mercedes-Benz E-Class
503 Great Deals out of 18,784 listings starting at $1,000
Used Ford Mustang
644 Great Deals out of 39,658 listings starting at $995

Used Cars for Sale

2019 Audi S4 For Sale
833 listings starting at $45,495
2018 Audi S4 For Sale
10 Great Deals out of 116 listings starting at $36,100
2016 Audi S4 For Sale
3 Great Deals out of 47 listings starting at $22,987
2015 Audi S4 For Sale
60 listings starting at $17,995
2014 Audi S4 For Sale
4 Great Deals out of 81 listings starting at $18,500

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. Content will be removed if CarGurus becomes aware that it violates our policies.