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Nov 1, 2007 | 12:08 PM

2002sue

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Audiworld Junior Member

Joined: Mar 2003

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I have a question

Is it normal for the check engine light to turn its self off ?

I've owned a 1998 A4 smq for 6 years.
I bought the car with 72k miles, It currently has 90k miles.

At 75k I did the t-belt and h20 pump.
about the same time the air flow sensor failed and I replaced it.

Lately the cars rpm will jump up to about 1500 rpm for a sec or two when I turn the car on after a warm start.

this morning the check engine light came on.

I went ahead and replaced the air filter and sprayed the air flow sensor with some crc cleaner.

After I started the car three times the cel went away.

I've never had the cel come on before this morning.

Should I be concerned, Should I have it read, or just keep rolling ?

thanks for any suggestions.

Mark Radovan
1998 A4 smq
1983 Ur quattro
MontereyBayBavarian
Santa Cruz,Ca

Nov 1, 2007 | 12:10 PM

Silver Streakin'

Member

Joined: Oct 2000

Posts: 41,948

Likes: 1

From: PA

yes, the CEL can go away, but that doesn't mean the car fixed itself. it still will have the code

stored. find someone local with a VAG.

Nov 1, 2007 | 12:16 PM

2002sue

Thread Starter

Audiworld Junior Member

Joined: Mar 2003

Posts: 49

Likes: 0

Re: yes, the CEL can go away, but that doesn't mean the car fixed itself. it still will have the co

thanks for the reply.

Can I buy a VAG program and cable for my laptop computer and read it myself ?

Nov 1, 2007 | 12:19 PM

Silver Streakin'

Member

Joined: Oct 2000

Posts: 41,948

Likes: 1

From: PA

yes. go to the Ross-Tech site. you can just DL their shareware version with a $20 eBay cable

to just check codes.

Or, buy the entire VAG that does the logs as well. Or, just buy a license for $99 with the $20 cable, but you won't get any support from Ross-Tech should something go wrong.

You'll probably need the download the drivers for it to work with a USB. search my user number. I posted the link to them that worked for me.<ul><li><a href="http://www.ross-tech.com/">http://www.ross-tech.com/</a</li></ul>

Nov 1, 2007 | 12:30 PM

Pure Hatred

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Joined: Aug 2007

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Figure this one out...

Cruising at 65mph for a good while......... All of a sudden, WHAM! (thats right I said wham). It felt like I went from WOT @ 6500rpm to closed throttle with bad motor mounts, that kind of wham. I lost 15 mph in less than 5 seconds, CEL comes on.....then goes off and engine runs fine again. Go to scan codes....using VAG, nothing, not a code. Try using global OBD2 to see if had a history code, same, nothing. Never happened again.

Nov 1, 2007 | 12:36 PM

2002sue

Thread Starter

Audiworld Junior Member

Joined: Mar 2003

Posts: 49

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muy bueno

Excellent, thanks for the help.

btw, I'm very imprest with your cars set up.

I've considered tuning my A4,(its bone stock) but at this point I'm considering replacing it with a B6 or b7 4 cylinder.

thanks again,
2002sue

Nov 1, 2007 | 12:42 PM

2002sue

Thread Starter

Audiworld Junior Member

Joined: Mar 2003

Posts: 49

Likes: 0

Re: Figure this one out...

weird.

My 2001 dodge 3500 TD cel comes on every 50 starts and stays on for another 10 starts.

The truck has 218k miles and 20k on the trans which shifts smooth as butter.

when I had the cel read it came back with 15 codes all for the transmission.

I'm not concerned or I guess I just don't care any more.