Mercedes-Benz Settlement Resolves Class Action Lawsuit Over ‘High-Cost’ Emissions Warranty Parts

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Mercedes-Benz USA has agreed to settle a class action lawsuit that alleged the automaker failed to accurately and comprehensively identify all “high-cost” or “high-priced” vehicle emissions parts under California law, apparently in an effort to reduce its exposure to warranty claims.

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The Mercedes-Benz USA class action settlement received preliminary approval from the court on December 4, 2025 and covers all individuals who purchased or leased a 2015-present model year Mercedes-Benz vehicle and meet the following criteria:

• The vehicle was registered in any of the following Section 177 states that abide by California’s emission and pollutant regulations between the state-specific model year starting periods:
  • California, Connecticut, Delaware, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont and Washington between model year 2015 and the present;
  • Colorado between model year 2022 and the present; and
  • Minnesota, Nevada and Virginia between model year 2025 and the present; and
• Your vehicle was covered under the high-price part (HPP) warranty provided by Mercedes-Benz, covering emissions-related parts for the period between four years and 50,000 miles and seven years and 70,000 miles (most vehicles are covered by the HPP warranty unless it is an electric vehicle); and
• You paid to diagnose, repair or replace any of the following 14 subject parts in your vehicle between four years and 50,000 miles and seven years and 70,000 miles:
  • Manifold PCV Connection Assembly;
  • Power Train Control Unit (PCM);
  • Accelerator Pedal Sensor;
  • Accelerator Pedal;
  • Partial Load Operation Crankcase Ventilation Valve;
  • Clean Air Line;
  • Pressure Sensor Downstream of Air Filter;
  • Check Valve within the EVAP System;
  • Crankcase Ventilation System;
  • Vent Control Valve;
  • Charcoal Canister;
  • Fuel Tank Level Indicator Fill Level Sensors;
  • Coolant Thermostat; and
  • ESP Electronic Stability Program Control Unit.

The court-approved website for the Mercedes-Benz USA (MBUSA) settlement can be found at HazdovacEmissionsWarrantySettlement.com.

According to the website, MBUSA settlement class members who file a valid, timely claim form have multiple options for reimbursement.

The settlement agreement says that class members can file a claim form to receive compensation for qualified repairs and replacements of subject parts in their vehicle performed at an authorized service center between the four-year/50,000-mile and seven-year/70,000-mile warranty period. The agreement outlines that MBUSA has agreed to reimburse up to 50 percent of the out-of-pocket expenses incurred by class members for qualified repairs, limited to the cost of parts, labor and diagnosis.

Class members may also submit a claim form to receive compensation for qualified diagnoses of a subject part on their vehicle, performed at an authorized service center between the four-year/50,000-mile and seven-year/70,000-mile warranty period, that a class member did not repair or replace at the service center, or at all. The agreement notes that MBUSA has agreed to reimburse up to 100 percent of the out-of-pocket expenses incurred by class members for qualified diagnoses, limited to the cost of labor and the diagnosis itself.

MBUSA class members may elect to receive their class action settlement payout via check or electronic payment, the agreement adds, and all checks must be cashed within 180 days of issuance before expiration.

As part of the settlement, MBUSA, moving forward, has also agreed to provide 100-percent coverage for the cost to repair, replace or diagnose a subject part at an authorized service center between the four-year/50,000-mile and seven-year/70,000-mile warranty period on vehicles registered in Section 177 states.

According to the agreement, class members will not be required to present any settlement-related documentation or authorization in order to receive service covered by the extended HPP warranty coverage at an authorized dealership, nor will MBUSA impose any fees or charges in connection with the service.

Importantly, the agreement stipulates that there will be “no double recovery” collected under the settlement, meaning class members cannot receive compensation for amounts already covered by the automaker and may only receive payment for unreimbursed losses.

To submit a Mercedes settlement claim form online, class members can head to this page and enter the settlement claim ID found on the postcard they received by mail to begin filling out the form.

Alternatively, class members can download a PDF of the claim form to print, fill out and return by mail to the address of the settlement administrator on the third page of the document.

All Mercedes-Benz warranty settlement claim forms must be submitted online or by mail by May 15, 2026.

The court will determine whether to grant final approval to the MBUSA warranty settlement following a hearing on June 25, 2026. Compensation will begin to be distributed to class members only after final approval is granted and any appeals have been resolved.

The Mercedes-Benz class action lawsuit alleged that the automaker, in an apparent effort to reduce its liability for warranty claims it would have to pay to drivers experiencing vehicle issues, failed to properly classify certain vehicle parts as “high-priced,” in violation of a California law requiring that high-priced parts come with a seven-year, 70,000-mile emissions warranty. As a result, the lawsuit contended, consumers were left to pay higher repair, replacement and diagnostic costs for emissions parts that should have been covered by Mercedes-Benz under the HPP warranty.

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