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The test is a simple plug in OBD2 communication between the car and the analyzer or a simple 2 speed idle tail pipe test hooking up testing equipment to your tailpipes.
Worst case, it could be a major engine or mechanical problem that will cost thousands of dollars to fix. The most serious problems are probably anything that would cause the engine to suffer severe misfire — that could be a cylinder that loses compression or has a mechanical issue, or the spark plug stops working. You’ll notice that, because in that case, the check engine won’t just be on. It will flash.
Assuming it’s something more serious than a loose gas cap, a mechanic can run a diagnostic to determine which monitors failed the test. The diagnostic might reveal that these three monitors failed the test, and so they had this repaired, and now we’re seeing that we have valid criteria, so there’s monitors and a pass.
Check with your state and county, as older cars in many states are exempt from tests. The OBD-II requirement in 1996 was pretty much a line in the sand. Anything prior to 1996 is going to need to have the treadmill test.
Information from the OBD-II is considered to be absolutely reliable — it’s not generally something that anyone could really tamper with. Going from station to station isn’t going to come out with a different result if your vehicle has failed. While you may be able to have a shop reset your check engine light, you can’t reset the information from the OBD-II. Getting a second opinion from a mechanic, on the other hand, is another matter.
Yes. In short, it’s all about that check engine light — an indicator that the OBD-II has detected a malfunction in your car’s emissions controls. If that light is on, most facilities count it as an ipso facto failure: Virtually all states with emission testing list an illuminated check engine light as a failure in and of itself.
Generally speaking, yes. Cars can certainly fail a test without the light on, but experts agree that if the light is off and you haven’t manipulated the system, you shouldn’t lose sleep over the possibility of failing the test.
If it’s just a shortcut, Meier advises against it. Some people have tried in the past to turn the check engine light off or have it reset and then go get their test before it comes on again. But OBD-II systems generally store their codes, and the only way they’ll go away is when the computer runs its own tests, he added. That’s the case even if you buy a do-it-yourself tool to turn off the light.
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Certified emissions
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