Every few weeks someone asks for ABS for a part going in a car, and it's a reasonable instinct. Moulded car interiors really are mostly ABS blends. But a printed part isn't a moulded part, and the question that matters is a different one: how hot does the inside of a car get, and does the material survive it?
The test
The same mounting bracket was printed in PETG and ABS, both at 0.2 mm and 30% infill, and left on a dashboard in a Liverpool car park for a week in late September. Not a lab, but then neither is your car.
Print settings used
What happened
Dashboard temperature peaked at 61 °C on the Thursday. The PETG bracket looked fine but had taken a slight set where it rested on the vent, about half a millimetre of bow. The ABS bracket was unchanged. In July the gap would be wider.
Near glass, pick ASA or ABS. Under a seat, PETG is fine and easier to print well.
What to use
For anything on or near the dashboard, rear shelf or windows: ASA first, ABS second. ASA has the same heat resistance and doesn't go chalky in sunlight. For brackets under seats, in the boot or behind trim: PETG, because it's tougher on impact, easier to print accurately, and cheaper.
If you're not sure where it lives, say so when you upload the file and you'll be told which one.