C70 cold start issues

Sounds familiar. I've got a C70 as well, though I can't remember what year exactly. Had similar symptoms last winter – rough cold starts, error codes popping up, and the fuel economy went south. Did you check the electrical connections to the heater? Also, is it blowing cold air when it should be warm?

Thanks for the quick reply! I haven't checked the connections yet, to be honest. I'm not really sure where to start looking. And yeah, it's definitely blowing cold air for longer than it should be on these cold mornings. How did you resolve your issue?

Okay, cold air points strongly to the PTC heater being the culprit. I went through the same rigmarole. Honestly, unless you're really comfortable with electrical diagnostics, I'd suggest getting it checked out by a workshop. Mine ended up needing a new heater, which cost around 350€. It's annoying, but it sorted the problem completely.

Appreciate the advice! Sounds like I'm heading down the same road. I'll book it in with a workshop and see what they say. Hopefully, it's just the heater and nothing more serious. Thanks again for sharing your experience!