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How to determine your vehicle's emission system:
1. Find the vehicle's emission certification label. It is located in the engine compartment, usually on the under-side of the hood, the radiator support or the inner fender.
2. All vehicles will have a standard of "Federal" or "California" noted on this label.
3. On vehicles 1995 and newer, the "California Standard" vehicles will also note TIER-1, TLEV, LEV or ULEV. Vehicles with different levels can require different parts. This can be tricky to find, but it is there, so read the label carefully.
EMISSION SYSTEMS:
You must always identify the type of emission system a vehicle has prior to buying an exhaust part. The particular emission system a vehicle uses will determine the exact replacement part required. Failing to determine the emission system in use could lead to the purchase of an incorrect part.
FEDERAL EMISSION STANDARDS:
-Minimum acceptable standard. Applies to all states except California, Massachusetts, New York and Vermont.
-This standard is set by our federal Environmental Protection Agency (EPA). Vehicles certified to these standards are generally referred to as "Federal", "49-state" or "exc. California" in our item description.
CALIFORNIA STANDARDS:
-More stringent standard. Applies to only California, Massachusetts, New York and Vermont.
-This standard is set by the state of California Air Resources Board (CARB). Starting in 1995, five levels of California standards were set up. The levels of California certification are as follows:
1. TIER-1: This is what was commonly known as California Emissions.
2. TLEV: (Transitional Low Emission Vehicle): 50% cleaner than a TIER-1 Vehicle.
3. LEV: (Low Emission Vehicle): 70% cleaner than TIER-1.
4. ULEV: (Ultra Low Emission Vehicle): 85% cleaner than TIER-1.
5. ZEV: (Zero Emission Vehicle): only electric vehicles meet this standard at the present time.
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