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Old 04-20-2009, 07:57 PM   #1
07ImprezaMB
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Default CEL about 3k miles after exhaust install. Help!

Ok so about a month and 3000 miles ago i put a headerback exhaust on my 07 2.5i. Last night i was driving about 75 on the interstate and my check engine light popped on and cruise light started flashing. It running completley fine. My assumption is that when i put on my high flow cat i did not use a 02 sensor spacer. But why would it wait until almost like 3500 miles later to pop a cel? Plz help that little check engine light is driving me crazy!!!!!! Thanks.
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Old 04-20-2009, 10:44 PM   #2
wmdoucette
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Maybe pull the code and see what it is first? Could be some unrelated event.
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Old 04-21-2009, 10:02 AM   #3
sa4baru
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could be p0420 - cat inefficiency (gotta find out what it is 1st) . if it is, you can permanently turn off the code w/romraider.
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Old 04-21-2009, 06:32 PM   #4
07ImprezaMB
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Yes i ran the code i forget the number but it said something about my 02 sensor and cat inefficiency. So i ordered a 02 sensor spacer for my rear 02 sensor. See if that fixes it.
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Old 04-21-2009, 06:35 PM   #5
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I've learned to live with the 0420 cel. The spacer didn't fix it for me. It takes a while but you learn to just ignore it. I've just gotten in the habit of pulling the codes and clearing them every oil change to make sure nothing else ever pops up. I don't consider it much risk because if it was something really wrong the car would start acting up anyway. The CEL is just another idiot light. Paying attention to your vehicle is far more important than paying attention to that light.
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Old 04-22-2009, 12:37 AM   #6
sa4baru
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^ it's not so much the CEL itself, it's the damn flashing cruise light.
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Old 04-22-2009, 02:25 AM   #7
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mine comes on sometimes 5 miles after i clear it, sometimes a few hundred, always p0420 though.
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Old 04-23-2009, 04:47 PM   #8
07ImprezaMB
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ok so last night i needed gas. I filled it up and when i started it the cel and blinking cruise light were gone????? They stayed off for about 2 hours. Then they came back on again. Any reason why they would just kick off by themselves? i didnt clear them or anything.
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Old 04-23-2009, 06:10 PM   #9
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yeah my car has the same thing, it comes back on after about 4 hours of driving after i delete the code, its a pain in the ass cause you cant use cruise control but i hardly ever use it that much, its gunna suck going to college next year and not having cruise (2 1/2 hour drive on open highway)
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Old 04-28-2009, 09:49 PM   #10
07ImprezaMB
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So today i got my O2 spacer from rallitek and put it on and to clear my ecu i disconnected my battery for like 5 minutes and hooked it back up. It fixed the check engine light but my idle was being really screwy. It was idling at 100-200 rpms and a couple times when i was driving then slowed to a complete stop the car would stall.

So i let my car sit for almost a half hour just running at idle and it fixed itself now it is back to normal. Why would it do that? My guess is that the ecu was readjusting itself to my mods and getting the mixure right to idle normally again....... but i dunno. What do you guys think?
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Old 04-28-2009, 11:00 PM   #11
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i think that spacer is no bueno and will acually mess with the rear o2 reading and you'll be creating a bad scene for yourself when it seems what you want to do is create a sweet scene for yourself.

skip the o2 spacer and wrap your headers .

2nd lee . is your high flow cat metal substrate or ceramic?

the reason i ask and the reason i say wrap your headers is because your cat isnt getting hot enough. so the rear o2 is reading similar amounts of whatever as the first o2 is = cat fubar'd!

we know its brand new though .

you need to address this issue . don't just ignore it and think your a bad ass driver as others have stated .

your motors performance and your overall saftey are at risk .

what headers and cat are you using?

i have your same car and also have full headers back with no issue of a flashing ecu code being thrown or stunted performance from a code / inacurate readings .
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Old 04-28-2009, 11:18 PM   #12
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With the 05+ cars, you have to leave the O2 sensor fully in the exhaust stream or it will affect fueling. This will almost guarantee that you will get a P0420 CEL. You just have to live with it or have it disabled in a tune.
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Old 04-28-2009, 11:37 PM   #13
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you cant fully disable it in a tune though and when you go for inspection the code will show up on the reader .

all disableing will do it have it stop flashing
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Old 04-29-2009, 12:03 AM   #14
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Not true. If you disable the CEL in RomRaider, it won't show up in a scan.
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Old 04-29-2009, 12:05 AM   #15
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you positive about that?
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Old 04-29-2009, 12:07 AM   #16
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im not saying your wrong because you are the man with rr . but i swear i thought what i said was gospel
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Old 04-29-2009, 12:08 AM   #17
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Well, I can say it's true on my ECU with the scan tools I've used

I have the P0420 CEL deleted on my car. When it throws other CELs and I scan it, the P0420 CEL is never listed.
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Old 04-29-2009, 12:14 AM   #18
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but does it show if its ready? granted it oesnt show the code but state inspections are more in your business than tha . at least in my state they are .

here is what mr. tea cups has to say on the issue i found in a related post.

No, disabling the DTCs does nothing in relation to the readiness tests. That is, it does not hurt, it does not help, whether they are disabled or enabled. The only thing that impacts the readiness tests are the cat efficiency fixes (whose description was incorrect under previous ECU defs) under the emissions tab and also the force readiness fix.
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Old 04-29-2009, 12:15 AM   #19
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p.s. your ecu throws codes?
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Old 04-29-2009, 12:19 AM   #20
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Yes, the readiness tests are a separate issue. While the scan doesn't find a P0420 CEL set, I'm sure that a proper OBD-II scan such as done at a government testing station would find that the cat tests were reporting Not Ready.

However, the OP seems mainly to be concerned about getting his cruise control back.


Yes, I don't have any cats at all, so my car likes to throw the P0420 CEL if I don't disable it. Additionally, when something actually is wrong with the engine (like an unplugged MAF) it'll throw codes like it's supposed to.
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Old 04-29-2009, 09:27 AM   #21
07ImprezaMB
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I have genuine borla header and stromung high flow cat pipe. ( i wish you guys would have chimed in before i when and spent 35 bucks on a spacer)
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Old 04-29-2009, 10:15 AM   #22
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Quote:
Originally Posted by 07ImprezaMB View Post
ok so last night i needed gas. I filled it up and when i started it the cel and blinking cruise light were gone????? They stayed off for about 2 hours. Then they came back on again. Any reason why they would just kick off by themselves? i didnt clear them or anything.
If the car goes through 5 consecutive start/drive cycles without the sensors recording anything that is outside of specification the CEL will go back off. It just means that for whatever reason you were running within spec for a while. Inevitably it will go outside of spec again and the CEL will return.

On the older cars the cruise control doesn't flash. I can totally see how that would be annoying.
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Old 04-29-2009, 04:42 PM   #23
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Quote:
Originally Posted by 07ImprezaMB View Post
Yes i ran the code i forget the number but it said something about my 02 sensor and cat inefficiency. So i ordered a 02 sensor spacer for my rear 02 sensor. See if that fixes it.
could you verify that it is indeed P0420? becouse after i installed my borla uel, i threw a code but there was no flashing of the cruise light. I also am pretty certain that the cruise light doesnt flash unless there is a "more serious" CEL that could impact the cars lifespan if not fixed relatively quickly...anyone verify this?
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Old 04-29-2009, 04:46 PM   #24
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No, the cruise is supposed to flash no matter what. HOWEVER, I have now seen about 3-4 05 RSes randomly light up their CEL, no blinking cruise, no stored DTC if you scan it, and then randomly turn out the CEL later.
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Old 04-29-2009, 04:48 PM   #25
watchunglava
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doesnt that flashing cruise mean your in limp mode?
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