Three times, my Volvo XC90's emissions system has thrown a code (don't know which) ONLY when I go over a certain mountain of 4,900 ft. Volvo says replace the emissions system for $4K. Any insights
The elevation will definitely affect your emissions. Your vehicle would have to be tuned for that elevation, area of the country. Your car probably was tune for like up to 1500 ft. elevation since the air is more dense at a lower altitude.
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