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Vehicle Maintenance Tip

If the Check Engine or Service Engine Light blinks or flashes while the engine is running, your vehicle has a serious emissions-related problem that needs immediate attention in order to prevent permanent catalytic converter damage.
More Vehicle Maintenance Tips

Inspection and Repair Industry: Emissions Replacement Parts

Massachusetts repair shops can use ONLY parts that have been approved by the California Air Resources Board (CARB) for emission repairs of model year 1995 and newer vehicles. This requirement, which is part of Massachusetts’ Low Emission Vehicle Program, is designed to ensure that emission repairs are effective at preserving the clean characteristics of Low Emission Vehicles (LEVs) and at keeping their OBD systems working correctly.

What does the LEV Program mean for repair shops? When you make emissions-related repairs, you must be sure to install only approved emissions parts. If an aftermarket part is not allowed to be sold in California, then you cannot sell or install it in a Massachusetts vehicle. Of course, original equipment manufacturer (OEM) replacement parts are acceptable.

CARB’s list of vehicle pollution control system parts is extensive, and includes things that you may not be routinely associate with emissions-related repairs. For example, CARB’s list includes air cleaners, catalytic converters, computers and computer chips, turbochargers/superchargers, electronic ignitions, fuel injection, fuel tanks, air injection systems, exhaust gas recirculation (EGR) systems, fuel evaporation systems, internal engine parts, replacement engines, and transmission or transaxle replacements.

To find CARB’s complete list of emissions-related parts, visit the California Air Resources Board Web site:

Please note: There may be consequences if you don’t use parts that are CARB-approved for emissions-related repairs of Massachusetts vehicles. If your shop installs an emissions-related aftermarket part that is not on CARB’s list, the vehicle owner can demand that you either replace the part with one that is on CARB’s list, or that you reimburse him or her for replacing and installing an approved part.

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