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Old 05-06-2004, 11:33 PM   #1
truckresi
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Join Date: May 2004
Exclamation Fail Smog Test after OBDII Reset

I just returned from a 3rd party smog inspection station after failing a smog test with my STOCK '00 2.5 RS. Before dropping the car off I reset the ECU to turn off the pesky CEL that comes off and on (checked out as a 0420). I noticed it usually turns on while cruising the freeway... Anyway that's another issue.. I was shocked when I returned to find that I failed the test.. and not because of the 0420 code. The tech said I automatically failed because "the computer could not complete the monitor tests" He said there are several of these smog "monitor" tests built into the OBDII system, and since my car couldn't complete them, I failed... I guess it's related to me resetiing the ecu 1 mile away from the service station. Anyone have this problem before? Anyone know what I need to do to complete these tests? Tech said if I come back in a week it should work.. I don't have that much time!!!!

Thanks in advance!
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Old 05-06-2004, 11:58 PM   #2
Keith Cournoyer
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Default Smog Test

I did the same in Massachusetts, the guy asked me if i disconnected the battery or something, I just said I went to the dealer for a "tune-up", and they must have. So he grabbed the old tail pipe prob and finished the test. I passed emissions, but failed the O2 part. I'm quite modified and still passed. Go to a dealer and have them fix it. That's just not right!
Good Luck,

Keith
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Old 05-06-2004, 11:59 PM   #3
Keith Cournoyer
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Default Emission

Correction, I mean to say I failed the OBD II part(readiness), not O2.
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Old 05-07-2004, 07:49 AM   #4
Mulder
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This is a built-in function in the OBDII standard. The ECU regularly performs a set of "readiness tests" to monitor the condition of various major components. When the car is scanned, the first thing that comes up is the status of these tests, "complete" or "not complete". Any time a full reset is performed by disconnecting the battery, or a "clear codes" command is sent from a scanner, the readiness test status is reset to "not complete" and the tests have to be performed again. This was done on purpose so it wouldn't be possible to mask a problem pre-inspection just by doing a reset, unfortunately you've discovered it the hard way. If your state does inspection via OBDII scan, you will fail if the CEL is on, any codes are present, or the readiness tests are not complete.
There is no way to "fix" a "not-complete" status other than to drive the car until the tests complete themselves. It should take a couple of days of normal driving.
One other thing that has been known to interfere with the readiness tests is installing an electrical "CEL fix" for a catless downpipe. Although the fix may eliminate the constant CEL, some have been known to prevent the tests from completing and will cause an inspection failure if it requires an OBDII scan.
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Old 05-07-2004, 12:34 PM   #5
truckresi
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Default

After doing a little more research on this site and around the net, I think I may have a window of opportunity where the readiness test will be complete yet the 0420 code will not come up. I figure I should go for a few drive cycles (driving like a crazed mainiac to 'teach' my car that the 0420 thing is really only on the freeway) and then go in for a retest... I wish I would have known all this before.. I also found out from this site that Subaru has a 60k mile warranty on their CAT's??? I sold my car and told the buyer it would have a smog certificate on sale... I have to drop the car off tomorrow.. If I don't pass, I'm going to the dealer

Thanks for the replies!
WISH ME LUCK!
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Old 05-07-2004, 12:35 PM   #6
truckresi
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Oh yeah, anyone know if CA will allow the sniffer test in lieu of a OBDII test?
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Old 05-07-2004, 12:42 PM   #7
Mulder
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You won't be able to "teach" the ECU when to set the P0420. However, you can avoid the type of driving where the ECU conducts its catalyst efficiency tests, which is sustained steady-throttle driving at normal operating temperature. If you do mostly or exclusively local stop-and-go driving the inefficiency code may not come up for a while. OTOH, it's also possible that under those conditions the readiness tests may not fully complete either.
There are extended emission warranties on certain components, including the cat. These warranties are for different terms depending on what state you are in, the info is in a booklet that came with the car along with the owners manual and other documents.
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Old 05-07-2004, 01:20 PM   #8
Julian
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truckresi, they require/perform both here in Cali. You'd get the load test as well, if you have FWD or RWD.
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Old 07-30-2006, 01:20 AM   #9
CrazyMike13
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Mine also only seems to come on when i'm cruising in 5th at 55mph. Any way to avoid that, as a major travel route is a 55mph speed limit and I don't want to adjust my speed every 5 seconds.

-CM!3
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Old 07-30-2006, 03:47 AM   #10
racerx7
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I THINK anything smog related is 7 years 100k in CA. ( I think )

Call your dealer and ask.
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