If this vehicle is driven in the city almost exclusively, take it out on the freeway a good 30-40 miles prior to taking it back to the smog shop. that should prime all the readiness sensors. make sure your doing some speed and not just going 55 in the slow lane. get the system nice and hot.
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If the problem is that the MIL is not responding to computer scans, then driving it a million miles will not fix the problem. Driving the car (VW Passat about 50miles above 60MPH) can clear recentely removed codes, but cannot repair a malfuntioning MIL, or more commonly refered to as the ENGINE LIGHT. If you can get a scan tool to communicate with your cars EnigineControlModule(ECM), then you are good to go, but I suspect that your MIL will show up as N/A or OFF, or not at all.
At this time, only a dealer can fix your computer woes, and for a heafty price. However, Your ECM is easy to removed, and can be fixed for around $300, I have seen on the net. Once installed though, you will need the dealer to reprogram the thing. I have seen, but not tried, a flash device to set the codes with software from a laptop. I am skeptical, but it says it works with VW, and it is very easy to use, and cheap enough. One thing though, VW is notorious these days for making their cars difficult to work on without special knowledge and tools. I have performed many repairs on my 2001 VW passat V6 30v. They are cheap and easy to fix with the know how, and inter-net prices on most parts, but they do have some reoccuring issues.
Ok. The car performs a bunch of silent self tests when you are driving. One of these, and if I had to bet, would be the evaporative emission tests- basically the car checks to make sure any evaporating fuel is going where it should be, and not getting released into the air to pollute, blah blah... What this has done, in addition to remove a teeny tiny amount of pollution is to drive techs and car owners crazy.
The car wants a certain speed, distance, temperature, and moon phase to complete these tests. If you are only traveling 15 miles back and forth to work everyday then the car might not find the "ideal" condition to finish the tests. This weekend, go for a drive somewhere. Somewhere far, so you have to burn through a half tank of fuel, at the very least.
Vehicle smog test failed Due to NO MIL/check engine light?
http://schematicsdiagram.blogspot.com/2011/12/vehicle-smog-test-failed-due-to-no.html
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gas engine and they did not get any codes becuase my check engine light was not on therefore they did not perform a diagnostic, the just gave me a print out that the MIL check engine light failed due to failure to complete all OBD self tests...what is not making and the printout said not ready what i am not understanding is what the problem is..? the dealership said i need to drive it more on the freeway but in lower gear...this does not make sense why could the dealership not figure out what was wrong with the computers? how can i get this resolved obviously driving my care over 300 miles did not solve the problem..
gas engine
Thank you for all the suggestions i am trying to say that i have already tried this drove it over 300 miles in like 4 days then had it re-smogged and it failed again, i took it up to speeds of over 80 miles per hour then today did again what the service manager told me to do which was drive it in the slow lane at like 60 mph but in 3rd gear to get it to high RPM's do you think this will help? I guess i will go for a long drive this weekend to see what happens..thanks again for your suggestions i am clueless as to what else to do...but drive it
Is this a TDI, or a gas engine??
what codes are they able to retrieve?
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