CarStream BlogNotes from the CarStream team on telemetry, fault codes and the data a car keeps about itself.https://carstream.live/enFrom a code to a decision: how CarStream explains fault codeshttps://carstream.live/en/blog/how-carstream-explains-fault-codes/https://carstream.live/en/blog/how-carstream-explains-fault-codes/A fault code answers none of the three questions an owner has: can I keep driving, what is it likely to be, what do I check first. What the Explain button sends, what comes back, and why the answer is shaped the way it is.Sat, 24 Oct 2026 00:00:00 GMTWhat a fault code actually tells you, and what it doesn'thttps://carstream.live/en/blog/what-a-fault-code-tells-you/https://carstream.live/en/blog/what-a-fault-code-tells-you/P0420 is not a diagnosis. It is the engine computer saying that one measured value stayed out of bounds long enough to matter. How to read that, and why clearing it fixes nothing.Wed, 21 Oct 2026 00:00:00 GMT