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1999 Jetta check engine light question
saxman wrote:
> I have a 1999 (new body style) Jetta I just had a quick question about > my check engine light. It was extremely cold here a few days ago, and > I don't think I let the car warm up enough before I took off. As such, > the car ran a little rough at first, and the check engine light came > on. I stopped, let the car idle for a bit, and since then (2 days ago) > the car has run perfectly fine - but the check engine light is still > on. I'm planning on taking it to get the codes read, but my question > is this: Does the check engine light remaining on mean there could > still be a problem? Or does the light remain on after an error code is > stored (at least until the code is cleared)? > > The reason that I ask the question is that the check engine light > seemed to come on because of a specific event (starting when too > cold). Since it runs perfectly normally now - my first thought is to > get the code read / cleared, and see if the light comes back on. Does > this sound reasonable? Pobably the oxygen sensor getting tired...no matter the outside temperature. |
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#2
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1999 Jetta check engine light question
I have a 1999 (new body style) Jetta I just had a quick question about
my check engine light. It was extremely cold here a few days ago, and I don't think I let the car warm up enough before I took off. As such, the car ran a little rough at first, and the check engine light came on. I stopped, let the car idle for a bit, and since then (2 days ago) the car has run perfectly fine - but the check engine light is still on. I'm planning on taking it to get the codes read, but my question is this: Does the check engine light remaining on mean there could still be a problem? Or does the light remain on after an error code is stored (at least until the code is cleared)? The reason that I ask the question is that the check engine light seemed to come on because of a specific event (starting when too cold). Since it runs perfectly normally now - my first thought is to get the code read / cleared, and see if the light comes back on. Does this sound reasonable? |
#3
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1999 Jetta check engine light question
or maybe 100 or so other reason that can turn a mile light on. That's why
you need to post the fault codes, and I bet it's not the O2 sensors. "the car ran a little rough at first"... my money is you have a few misfire faults and if that's the case the MIL will turn itself off in a few more days. "al" > wrote in message .. . > saxman wrote: > >> I have a 1999 (new body style) Jetta I just had a quick question about >> my check engine light. It was extremely cold here a few days ago, and >> I don't think I let the car warm up enough before I took off. As such, >> the car ran a little rough at first, and the check engine light came >> on. I stopped, let the car idle for a bit, and since then (2 days ago) >> the car has run perfectly fine - but the check engine light is still >> on. I'm planning on taking it to get the codes read, but my question >> is this: Does the check engine light remaining on mean there could >> still be a problem? Or does the light remain on after an error code is >> stored (at least until the code is cleared)? >> >> The reason that I ask the question is that the check engine light >> seemed to come on because of a specific event (starting when too >> cold). Since it runs perfectly normally now - my first thought is to >> get the code read / cleared, and see if the light comes back on. Does >> this sound reasonable? > Pobably the oxygen sensor getting tired...no matter the outside > temperature. |
#4
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1999 Jetta check engine light question
"saxman" > wrote in message
oups.com... >I have a 1999 (new body style) Jetta I just had a quick question about > my check engine light. It was extremely cold here a few days ago, and > I don't think I let the car warm up enough before I took off. As such, > the car ran a little rough at first, and the check engine light came > on. I stopped, let the car idle for a bit, and since then (2 days ago) > the car has run perfectly fine - but the check engine light is still > on. I'm planning on taking it to get the codes read, but my question > is this: Does the check engine light remaining on mean there could > still be a problem? Or does the light remain on after an error code is > stored (at least until the code is cleared)? > > The reason that I ask the question is that the check engine light > seemed to come on because of a specific event (starting when too > cold). Since it runs perfectly normally now - my first thought is to > get the code read / cleared, and see if the light comes back on. Does > this sound reasonable? I'd wait a little longer and see if it clears. If it ran rough the system probably just detected a misfire and when it's "happy" that the misfire is a random thing and not a constant recurring item it might go out. |
#5
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1999 Jetta check engine light question
> I have a 1999 (new body style) Jetta I just had a quick question about
> my check engine light. It was extremely cold here a few days ago, and > I don't think I let the car warm up enough before I took off. As such, > the car ran a little rough at first, and the check engine light came > on. I stopped, let the car idle for a bit, and since then (2 days ago) > the car has run perfectly fine - but the check engine light is still > on. I'm planning on taking it to get the codes read, but my question > is this: Does the check engine light remaining on mean there could > still be a problem? Or does the light remain on after an error code is > stored (at least until the code is cleared)? Sometimes I have observed this if the car sat unused for a long time. I haven't been able to reliably reproduce it because it happens under those conditions only, for instance after such a period of non-use, the car will not idle smoothly or idles at a higher rpm than normal until the condition clears. The light generally has to do with an emissions failure/warning and will clear itself if the car is started without that condition recurring a few times (might last a few days). If the problem is recurring however this definitely requires attention. -- Jem Berkes www.sysdesign.ca |
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