Hello, I had some work done on my 1997 nissan 200sx such as changing a new battery. About a day later my car failed state emmissions test. The inspector says this happens alot when you disconnect the battery cable on a car and you may have to drive the car for a while such as 50 to 100miles so the computer can relearn itself. Is this true?
2007-01-31 15:10:14 · 7 answers · asked by CEDRIC B 1 in Cars & Transportation ➔ Maintenance & Repairs
It isn't relearning itself, it is running test on the emissions equipment.
Your car is a rolling smog machine. The law requires that the computer test ALL of the emissions parts regularly.
Items such as engine sensors and misfire counters can easily be checked by virtue of the engine running. But SOME components aren't computer components. So to test them the car must be driven for a period of time, in a certain manner so that the computer can test them (fuel cap, catalytic converter, EGR valve, etc.).
When you disconnect the battery, the computer loses the results of the last test (pass or fail) and registers a "not ready" status during the test.
Most of the techs can manage to clear nearly all of the MONITORS in less than 10 miles or so.
To see how this is done, do a "Google" for OBD II DRIVE CYCLE, and read the procedure.
If you are unfamiliar with this protocol, simply drive your car for 100 miles or so, but not all at one time. It needs some cold starts, some warm-up time, some stop and go and some easy freeway cruising.
Happy Motoring
2007-01-31 16:08:47 · answer #1 · answered by Ironhand 6 · 0⤊ 0⤋
Yes it is true. Your computer does have to relearn settings and should do it within 50 - 100 miles. Most cars will relearn with in the 50. You also could have some emissions problems on a Nissan that old. I would drive the car, change the oil and oil filter, and the air filter and get the emissions retested. ( a plugged air filter will flunk a car ). If you still fail, you need to go to a qualified mechanic and get your computer checked for trouble codes and work from there.
2007-01-31 15:22:09 · answer #2 · answered by Anonymous · 0⤊ 0⤋
to a point its true ,you don't have to drive that far for the computer to re-set its self though,it does take at least 10 miles t normal driving temperatures ,but not a 100 miles ,but yes it will affect the test a lot,good luck,i hope this help,s.
2007-01-31 15:17:51 · answer #3 · answered by dodge man 7 · 0⤊ 0⤋
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2016-10-16 09:41:08 · answer #4 · answered by ? 4 · 0⤊ 0⤋
yes
2016-07-06 09:44:43 · answer #5 · answered by Joseph 1 · 0⤊ 0⤋
Happened to mine!
2007-01-31 15:17:31 · answer #6 · answered by janejane 5 · 0⤊ 0⤋
dodge man nailed it.
2007-01-31 15:19:11 · answer #7 · answered by Anonymous · 0⤊ 0⤋