1998 540i smog and computer questions - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 06-02-2013, 10:23 AM
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1998 540i smog and computer questions

Hey everyone Iam back and with a question about the computer? I went to smog mmy 540i the other day and everything passed finally but when he hooked to obdii scanner to the car it had history stored and becuase of that it failed. The tec was pretty cool about it and said go for a long drive or poss the rest of the day. Well drove for 5 hrs went back and it still hadnt cleared.Is there any way to clear the history stored in he computer. Oh and I disconnected the batt overnite and did a cold start with ac on and rear wind defroster. HELP PLEASE. OH and hey vader!
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#2 (permalink) Old 06-02-2013, 05:16 PM
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Well i guess that means you didnt sell it! Thats good to hear.
It should have reset itself with the battery disconnect overnight. But since it didnt, try this:

Resetting Adaption Valves


PS. SOOOOOOOOOOO glad i dont have smog testing


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#3 (permalink) Old 06-02-2013, 07:55 PM
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Hey Vader! No I didnt have to sell it YEAH!!!!!!!!!!!!1 I dont really understand the post checked out and didnt make much sense to me. I got a great reader and scanner its an innovia works awsome. Finally got the previous owner and the car passed w/ flying colors till he plugged in and read history and then it failed, LOL. Maybe i should move to where your at huh. Im gonna try the batt 1 more time and will check back. Great to be back!!!!!!!!!!!!!
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#4 (permalink) Old 06-03-2013, 06:47 PM
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Whats the issue with "previous history" thats causing it to fail? That I dont understand.




Yay Canada. No smog testing. Home of the most obnixious exhaust pollutant vehicles on the road (outside of Europe!). Especially the diesel trucks.


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#5 (permalink) Old 06-04-2013, 04:45 AM
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You might be able to get the diagnostics errors cleared by someone with Carsoft or some similar software in your area. Maybe hit a local BMW workshop and see if they can do this for you.


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#6 (permalink) Old 06-05-2013, 01:06 PM
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I found out that the gas cap is bad gonna replace today and see if that does the trick. will check back and let you know
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#7 (permalink) Old 06-06-2013, 01:11 AM
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If they told you that you need to drive the vehicle a long distance then it is probably because your OBD2 readiness "monitors" need to be completed. The only way to do this is by driving the car multiple "drive cycles" in order to carry out the readiness tests and clear the monitors. The purpose of this is because pre-obd2 cars somebody who wanted to get a car through smog while knowing that a defect existed in the emissions systems was able to clear the check engine light with a scan tool then quickly run the car through a smog test before the light came back on and would be able to manipulate the system and get the car through smog.

The OBD generation 2 system was developed in order to prevent people from taking advantage of this loophole. Now, after clearing the check engine or SES lamp using a scan tool there is a series of readiness tests which must be completed in order for the vehicle to pass smog. The only way to complete these tests is to drive the vehicle under a series of conditions. Do a google search for "obd drive cycles" to get an idea of what these conditions are. Also take a look here: Onboard Diagnostic II (OBD II) HELP and here: OBD Monitor Not Ready

Now that you know the terminology there is plenty of info around the net which can help you without me being any more long winded than I already have been. The key is, if the chk engine (SES) light is NOT coming on but the readiness monitors absolutely will not clear then you must determine which monitors are not clearing in order to begin troubleshooting the issue.
Best of Luck,

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#8 (permalink) Old 06-09-2013, 11:17 PM
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well I replaced the cap and the check engine light came on even faster than with the old cap. What I dont understand is when i took to smog everything passed but history. So why is it still throwing codes,I dont get. It was a real hot day that day and everything passed. And now the codes are slow responce to both o2 sensors and cat. codes below standerds.I just dont get it. Why does everything work on hot days and not on cooler days? Iam pulling my hair out guys help
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#9 (permalink) Old 06-12-2013, 08:39 AM
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It may be time to take it to a specialist shop that can at least identify the problem for you


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#10 (permalink) Old 06-12-2013, 03:20 PM
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What I dont get is why it would pass all the smog requirements and then fail becuase of the history. Is it becuase there is a problem with the cats or 02 sensors. But if that were the case wouldnt it fail when its hooked up to the machine? This one really has me stumped. Maybe its time to take it too a shop but Ive been turning a wrench for twenty years but this one is stumping me and plus a shop will charge thru the roof. So if anybody has anymore suggestions please feel free
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#11 (permalink) Old 07-05-2013, 09:23 AM
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Quote:
Originally Posted by maddmanmike View Post
What I dont get is why it would pass all the smog requirements and then fail becuase of the history. Is it becuase there is a problem with the cats or 02 sensors. But if that were the case wouldnt it fail when its hooked up to the machine? This one really has me stumped. Maybe its time to take it too a shop but Ive been turning a wrench for twenty years but this one is stumping me and plus a shop will charge thru the roof. So if anybody has anymore suggestions please feel free
I'm not a smog tech - but pay attention to what Dirty Tool is saying. I think you're stuck on the word "History" and your smog inspector may have mis-spoke. "After clearing the check engine or SES lamp using a scan tool then completing a series of readiness tests" should be the focus if no active codes are indicated.
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