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Disconnect the postive battery lead wait about 30 and reconnect. If it's a real problem it will come back on, then time to put on computer to find error code.
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Probably something in the wiring harness or the engine computer.
A mechanic would watch the data stream from the O2 sensors to troubleshoot. You should also have trouble codes for the sensor in question.
dependent upon your state restrictions it needs to be either fixed or taken through a waiver process. in most any state that does smogs anything after 1996 with an engine light on will fail smog because it only comes on to warn you of an emissions related issue. I would suggest having it diagnosed at the nearest 2G smog certified shop...
It would help to know the state you're located,
Usually the smog test report will provide a brief reason for any failures. If not, the technician or shop should be able to tell you more specifically the reason for the failure.
Have you recently disconnected the battery from the car? If so, your car will fail an emissions test because the computer MUST be operational for at least 250 or so miles prior to the car being tested.
TAKE THE CAR TO A SMOG SHOP THEY CAN AT LEAST TELL YOU WHAT IS GOING ON [ MAKE SURE THEY DO REPAIRS ] SOME SMOG SHOPS ONLY DO SMOG CERTIFICATION, NO ACTUAL REPAIRS
If your 84 mustang is fuel injected, it has a check engine light. If it is carbeurated (like mine) it does not. 85 and up are EFI, 84 was the crossover year.
I had the same problem, then took my car to an expert repair shop who diagnosed the sensors and
found no problem with the car. They notified the DMV who was unaware of the problem, who then told the repair shop (John's Bascom Automotive) that they will adjust their computer system to allow a "two speed idle test". My bill was $95 and I still have to pay for a smog test after driving around for
a couple of days to clear the computer monitors, a fair amount and I gladly paid it.
John advised me that I'd get no satisfaction with Toyota or the DMV. I went to the dealership where I
bought the car and they said that the smog stations don't know what they're doing. They charge
about $100 and work around the P0500 code but it takes them about two hours to do this. I told
them that I should have been notified about the dyno none-compatability by Toyota and that Toyota
should have notified the DMV beforehand. I wonder how many speed sensors are being replaced by
unknowing smog shops around the state. I got Toyota's main customer support phone number and
will call them Monday. I'm going to get my pound of flesh ($95 worth) from the DMV next week also.
the no data error can be contributed to a bad interface cable or the scaqn tool was configured wrong and therfore could not connect to the ecm. I would recommend having a scan done again by a certiefied volkswagon tech chances are the mechanics used the wrong adapter cable or reader card. your smog problem could be that your evap canister is clogged therfore gives a bad reading.unfortunately you have to have a scan done but try an independant small shop that delas exclusively with foreign cars such as porche andd mercedez. the will have the correct scan tool and will be much cheaper than a dealership. your cost should be no more than 50 dollars US ... please rate this. thanks
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