Question about 1999 Volkswagen Jetta
Well, depending on the year of your car and the state in which you reside, the procedure might be to use an interface called the OBD-II system (AKA On-Board Diagnostics II) to test your emissions. The OBD-II is accessed from a little port near the hood release lever and can communicate with a diagnostics computer through a cord that mechanics use. The OBD-II inside of your car is a computer that monitors your car's functions and equipment. The speedometer failure will likely register on the OBD-II interface when a mechanic goes to check your emissions data that your car collects while you drive it.
Posted on Jun 29, 2008
Most of the Smog testers need to use the speedometer for testing since they have to test your vehicle emissions at 15mpg, 25 mph, etc. So you will likely need to get that fixed before your testing
Posted on May 30, 2008
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Posted on Jan 02, 2017
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A service technician will
turn off the dashboard "check engine" light after most repairs. This
resets the vehicle's emission system components to "not ready". The
status remains "not ready" until the vehicle's computer has had adequate
time to review the repaired component. This happens after the vehicle
is driven for a period of time established by the manufacturer.
If the vehicle's emissions system status is "not ready" when it is presented at the E-Check station during the initial test cycle,
a tailpipe emissions test may be conducted. If the vehicle is
transferred to another test type, the vehicle must remain on the
different test track until the vehicle passes the emissions test or
receives a waiver. For example, if the vehicle undergoes an OBD II test
and fails, it cannot be downgraded to a tailpipe test on a re-test; the
vehicle must pass the OBD II test.
For initial and subsequent tests, if a dashboard light is on when the vehicle is presented at the E-Check station, the vehicle will fail the test.
How can the vehicle status be made ready?
When a vehicle is driven through its normal drive cycle, the computer reviews the emission control
system and if the vehicle was properly repaired, the system resets itself to ready. A normal drive
cycle includes operation at both cruising speeds and in stop-and-go traffic for up to a couple
weeks. This process should be followed before bringing the vehicle in to be tested.
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