Typical repair cost: $20–$3,500
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Failed O2 sensor, leaky injector, or bad MAF. Codes P0172/P0175.
Restricted airflow forces the ECM rich.
Diesel black smoke usually means an over-fueling injector or bad timing.
On diesels — low boost = black smoke under load.
Persistent black smoke wastes fuel and fouls the catalytic converter / DPF — diagnose within a week.
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