Ran into a CEL yesterday. Threw a code for P0411 I believe, a blockage in the secondary air pump unit, or something along those lines. Turned out it was the vacuum line going to the combination valve. The line was too short and it was pinching somewhere, causing a blockage. So if any of you run into this and you are able to test all the other components, this may be your cause ....

 

I have a 2005 Audi A4 and a few weeks ago the check engine light came on. I thought it may have been because I didn't put the gas cap back on correctly after putting in gas (since it turned back off a few days later) but it has turned back on (after putting in another tank of gas). I don’t want to take it to the dealer just yet and get charged a bundle for replacing things that really don’t need replacing. I hear that sometimes the check engine light may come on because of “bad gas”??

 

this is awesome, because my check engine light just appeared today. i did noticed that my car misfired a few times after i replaced the coilpacks, and the spark plugs.

 

driving with check engine light is a bad idea...its dengerous !!!

 

great pictorial representation. informative post

 

That's interesting, my check engine light came on a couple a weeks ago, I was told at the dealership that my catalitic converters are going bad.

 

Hey guys I just had my check engine light come on yesterday after filling up with gas. I took it to advanced and they said there code reader said dci not found or somethin along the lines. But I took it to auto zone and they came up with- P1109 heated oxygen sensor- bank 2 sensor 2 and P0401 egr flow insufficient detected. Can any1 help me out with this??

 

ive been driving with my check engine light on for about a year now and i knew from the start it was just because of the gas cap but i also thought about replacing the o2 sensor but i talked to the guys at auto zone and they said it could be a little pricy so i put it off

 

Recently took my car to Auto Zone for a free reading on my car. These were the results:

P0722- Output speed sensor - no signal condition
P0507- IAC circuit condition or idle speed higher/lower than expected
P0171- Fuel trim bank one condition

I know the majority of what each of these problems mean but, if someone could thoroughly explain them (in normal terms, haha) that would be GREAT.
I just need to know the extremity of these codes. The best and worst outcomes of repair. Overall, I am looking for the price range.

Any help would be much appreciated!

 

would a CEL come on for a burnt headlight
Because i took my shizznit in and NOT a single code popped up,
Abs light on
Brake light Flashing