{"make": "Mercedes-Benz", "model": "C-Class", "segment": "luxury-sedan", "canonical": "https://cars.insightarise.com/mercedes-benz/c-class/", "generated": "2026-09-04", "data_through": "2026-09-02", "method_version": "2026-09-04", "source": "NHTSA Office of Defects Investigation: owner complaints, safety recalls and defect investigations", "units": {"complaints": "count of owner complaints on record for the model year", "per_year": "complaints per year the model year has been on the road (counted from 1 January of the model year; minimum 1 year)", "idx_vs_*": "per_year divided by the comparison group's mean per_year; 1.00 = same rate", "early": "complaints filed within the first 24 months after 1 January of the model year", "recent_12m": "complaints filed in the last 12 months of data", "severe": "complaints reporting a crash or a fire (each complaint counted once)", "recall_covered_share": "share of complaints whose broad component category also has at least one recall (a category match, not proof that the recall covers the complaint)"}, "limitations": "Counts are not adjusted for sales volume; complaints are self-reported to NHTSA and not verified individually; U.S.-market vehicles only.", "summary": {"make": "Mercedes-Benz", "model": "C-Class", "segment": "luxury-sedan", "term_shares": {"stall": {"count": 29, "share": 8.8}}, "years": [{"year": 2018, "complaints": 129, "per_year": 14.9, "recalls": 0, "severe_share": 3.9, "idx_vs_all": 0.35, "early": 28, "early_closed": true, "early_idx": 0.31, "recent_12m": 14, "recent_trend": "steady", "top_group": "engine", "investigations": 0, "park_warnings": 0}, {"year": 2019, "complaints": 75, "per_year": 9.8, "recalls": 0, "severe_share": 4.0, "idx_vs_all": 0.23, "early": 12, "early_closed": true, "early_idx": 0.15, "recent_12m": 15, "recent_trend": "steady", "top_group": "engine", "investigations": 0, "park_warnings": 0}, {"year": 2020, "complaints": 46, "per_year": 6.9, "recalls": 0, "severe_share": 10.9, "idx_vs_all": 0.16, "early": 10, "early_closed": true, "early_idx": 0.18, "recent_12m": 11, "recent_trend": null, "top_group": "engine", "investigations": 0, "park_warnings": 0}, {"year": 2021, "complaints": 15, "per_year": 2.6, "recalls": 0, "severe_share": 0.0, "idx_vs_all": 0.06, "early": 1, "early_closed": true, "early_idx": 0.02, "recent_12m": 8, "recent_trend": null, "top_group": "engine", "investigations": 0, "park_warnings": 0}, {"year": 2022, "complaints": 26, "per_year": 5.6, "recalls": 0, "severe_share": 3.8, "idx_vs_all": 0.13, "early": 17, "early_closed": true, "early_idx": 0.23, "recent_12m": 3, "recent_trend": null, "top_group": "electrical", "investigations": 0, "park_warnings": 0}, {"year": 2023, "complaints": 25, "per_year": 6.8, "recalls": 0, "severe_share": 8.0, "idx_vs_all": 0.16, "early": 18, "early_closed": true, "early_idx": 0.22, "recent_12m": 3, "recent_trend": null, "top_group": "adas", "investigations": 0, "park_warnings": 0}, {"year": 2024, "complaints": 15, "per_year": 5.6, "recalls": 0, "severe_share": 13.3, "idx_vs_all": 0.13, "early": 8, "early_closed": true, "early_idx": 0.11, "recent_12m": 8, "recent_trend": null, "top_group": "electrical", "investigations": 0, "park_warnings": 0}], "first_year": 2018, "last_year": 2024, "n_years": 7, "complaints": 331, "recalls": 0, "recall_by_year": [], "park_warnings": 0, "ota_recalls": 0, "crashes": 18, "fires": 0, "injuries": 11, "deaths": 0, "severe": 18, "severe_share": 5.4, "top_group": "engine", "by_group": [{"group": "engine", "count": 80, "share": 24.2, "ratio": 1.09, "page": true, "by_year": [{"year": 2018, "count": 40, "share": 31.0}, {"year": 2019, "count": 16, "share": 21.3}, {"year": 2020, "count": 9, "share": 19.6}, {"year": 2021, "count": 8, "share": 53.3}, {"year": 2022, "count": 2, "share": 7.7}, {"year": 2023, "count": 2, "share": 8.0}, {"year": 2024, "count": 3, "share": 20.0}], "recent_12m": 19, "prior_12m": 9, "recent_trend": "rising", "keywords": [{"term": "crankcase", "docs": 18, 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