2009 Emissions Testing Vehicle 
Tomorrow's Technician
NOVEMBER 27, 2023
Another problem is within the calibration of the vehicle’s ECM. California emissions-certified vehicles may have more sensitive oxygen sensor calibrations. The issue is vehicles that were manufactured for the California market find their way to other states. In the future, things will get complicated. arb.ca.gov.
Hollenshades Auto Service
JULY 7, 2023
Presently, the main driving standard for emissions output by vehicle powertrains are the US EPA Tier 2 and California LEV-II ULEV regulations. In 1999, the US EPA announced new Tier 2 NOx limits of 0.07gm per mile to replace the existing Tier 1 limits of 1.0gm per mile that were phased in from 2004 to 2009.
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