Failed Emissions Testing
Thirty-Day Grace Period
Tennessee Code Annotated 55-4-128 states…The owner of any motor vehicle who resides in any county in which the issuance or renewal of the certificate of registration, or any registration plates issued pursuant to chapters 1-6 of this title or a city or county vehicle inspection sticker, for such motor vehicle depends upon the successful completion of a motor vehicle emissions test, shall be:
Given a grace period of thirty (30) days from the date fixed for issuance or renewal in which to effect necessary repairs and successfully complete the emissions test administered prior to the date fixed for issuance or renewal, and repairs necessary to pass such test cannot be effected prior to such date;
Issued an inspection certificate by the motor vehicle emissions testing authority which shall state on its face the date the emissions test was administered and failed, and that a thirty-day grace period shall apply to such motor vehicle; and
The owner of any motor vehicle which did not successfully complete an emissions test administered prior to the date fixed for issuance or renewal and, after attempting the repairs necessary to successfully complete the emissions test fails the emissions testing again, shall be eligible to apply for a waiver from further emissions testing for that year; provided, that the owner has attempted repairs to the vehicle in an amount of six hundred and fifty dollars ($650.00) or more for model year 1996 and newer, two hundred dollars ($200) or more for model years 1981 - 1995, or seventy-five dollars ($75.00) or more, if the vehicle is of a model year 1980 or older, or has attempted repairs in such amount as established by the environmental protection agency to make the owner of a motor vehicle eligible for a waiver, whichever is less. The waiver shall be granted according to guidelines and procedures established by the air pollution control board.
Possession of a duly authorized inspection certificate issued pursuant to subsection (a) shall be deemed possession of a valid certificate of registration, registration plate, and inspection sticker for the duration of the authorized grace period provided by subsection (a).
The owner of any motor vehicle who resides in any county in which the issuance or renewal of the certificate of registration, or any registration plates issued pursuant to chapters 1-6 of this title, or a city or county vehicle inspection sticker, for such motor vehicle depends upon the successful completion of a motor vehicle emissions test, shall Diagnostic Information
Most vehicles can pass with minor, inexpensive repairs. Listed below are some helpful hints:
Commission causes for high hydrocarbons (HC) include: Vacuum leaks, ignition system malfunction, faulty computer controls, air injection system failure, incorrect engine timing, incorrect engine idle speed, improper fuel injector operation, and low compression in one or more cylinders, incorrect carburetor setting/adjustment, and inoperative/missing catalytic converter(s).
Commission causes for high carbon monoxide (CO) include: Dirty/clogged air cleaner, choke or carburetor malfunction, fuel injector operation, air injection system failure, carburetor float level maladjusted, incorrect carburetor settings/adjustment, inoperative/missing catalytic converter, defective evaporative system, and faulty computer controls.
Note: Most 1981 and newer vehicles have computer-controlled systems utilizing an oxygen sensor in the exhaust. A qualified technician should determine the cause of any failure. Diagnosis and troubleshooting of your vehicle's computer systems by anyone other than a qualified technician could result in damage to the system.
When returning for a retest, drive the vehicle for 15 to 20 minutes before arriving at the test station to ensure the engine is at normal operating temperature. If there is a line at the station, do not turn the engine off while waiting.
During the emission inspection just conducted on your vehicle, one or more factory installed emission control items were found missing, disabled or altered. Listed below is information, which may help you or your mechanic understand the required repairs:
Catalytic converter(s) is missing. A catalytic converter(s) of the correct type and configuration must be installed. You or the person returning the vehicle to the inspection station must present the converter(s) WARRANTY CERTIFICATE and the failed inspection report to the vehicle inspector. If the replacement converter is a manufacturer's original equipment model, only an invoice or receipt is needed.
Catalytic converter(s) is disabled or altered. The catalytic converter(s) must be replaced or repaired to the correct type and configuration and be welded or professionally clamped in place.
Fuel filler restrictor exceeds allowable diameter. A USEPA approved filler restrictor must be installed. Additionally, the catalytic converter(s) may have to be replaced as described in #1 above.
The fuel cap is missing or does not seal properly. To prevent fuel or vapor leakage, the correct type fuel cap must be installed.
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