Audi A4 The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.

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Old 08-03-2015, 09:41 AM
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Join Date: Apr 2015
Posts: 51

Originally Posted by tyjo2112 View Post
Ok, here goes. I'm hoping for some ideas. I bought an 03 A4 Quattro a month or so ago. I love the car, but the dealer was a bit shady. It had 125k on the clock, and some service records. The car ran fine. I knew when I bought it I'd be putting a timing belt, water pump, etc kit on it right away. It threw a code 122 miles after I bought it, misfire cyl 6. So I got a real good tune up on it, and a full syn oil change. Same code came back in 22 miles. Took it in and did the timing belt stuff, and threw a coil on 6. ( Looked at "old" parts, nearly new condition so that was a wasted 1750 bucks, but oh well.) Drove the stupid thing 22 miles, threw a misfire cyl 6 code AGAIN. What could be next in line for causing a misfire on 6? And, how can I check my cat converter myself for blockage? Is it possible even?

My car runs out nice. Nice nice. A little rough idle, but just because I'm listening and picky probably..... where's my next move?

Thanks in advance for any help you can throw my way.
Fuel, spark, air. Doubt air intake is an issue. Spark, you said you changed both plug AND coil? Could be an injector issue.

Tough, unless you or someone you know is good with a oscilloscope or a teardown to get to the injector.

Last edited by chapstick; 08-03-2015 at 09:45 AM.
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Old 01-19-2016, 01:36 PM
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Join Date: Jan 2016
Posts: 1
Default CEL- Fault Codes

My CEL is on in my 2002 audi a4 3.0 quattro fault codes-
p0130 p0025 p0431 p0741
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Old 04-07-2017, 05:39 AM
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Join Date: Jan 2017
Posts: 273

Hi guys! I know the online dealer DSR Leasing is trusted and offers best deals for car leasing. I'm sure that you'll get amazing deals here.
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Old 09-30-2017, 04:34 PM
dbx dbx is offline
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Join Date: Sep 2017
Posts: 1

Ok, I'm new here and having CEL issues so I read this. Thanks it helps.

However, the trouble I am having is that the CEL flashes under heavy acceleration and engine begins to sputter. I have a 2004 A4 1.8T and generally love the car. Checked the codes and it said cylinder 4 misfiring. Changed all 4 spark plugs with NGK double platinum, and all 4 coils with new. Problem went away for a day or two and is back again... Thinking to tackle the EGR / PCV system next. I believe there might be a leak in the vacuum check valve assembly, could that be source of the problem? Any input / suggestions would be appreciated.
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Old 03-10-2018, 09:12 PM
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Join Date: Mar 2018
Location: Hamilton Ontario Canada
Posts: 3
Default Help for a new audi owner.

Hi guys Ive had my a4 quattro for 2 weeks now and apoun buying it had a very low idle when car warms up (rough idle). I've had to drive the car to get safety, but only drive it out of complete necessity. I had my mechanic hook up his smoke machine and I in fact do have leaks. On my way back from getting my safety my check engine light came on showing P0444 and p0300. I will be finding my leaks and replacing vacuum lines tommoro, hopefully it resolves my issues. This car is very tuned and I'm having a hard time figuring out what stage clutch and and basic info on mods. On the hood says clutch masters and je pistons leading me to belive engine has be done. Exhaust is after market and very Loud again hard to find a brand on it, there is no cat.
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