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> visual and car ECU inspections

The rideshare driver I mentioned elsewhere in this thread[0] also told me that he knows people who tune engine firmware for diesels, and that they do disable error codes related to their tuning and the missing filter - and that it's important to be aware of this when getting the car repaired for unrelated issues, because the tuning hacks may mask problems in diagnostics and confuse the repair people.

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[0] - https://news.ycombinator.com/item?id=20235002




That definitely happens. My prior car was ECU modded by the prior owner to eliminate EGR which was a maintenance hog on the turbo diesels. Many aftermarket ECU flash programs can be undone if diagnostics are required.




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