The Fiesta, I unaffectionately mentioned in the engine blow up video, had the check engine light on (this happened before we put the dirty fuel in by the way!). For £6 I decided it’s well worth giving one of these ELM327 ODB-2 scanner clones you get on eBay a go.
In the video there is a little teardown to see how they can make and sell it for just £6. We find a surprisingly expensive chipset from Microchip (PIC18F and Microchip’s CANBus controller). They could be fake parts as I’m sure there is big demand for these in China which would keep the cost down. However, I suspect the reason they used these chips is because the stolen or open source firmware was written for the PIC18 and they didn’t have the skills to re-write it for a lower cost chip. It also explains the use of a crystal oscillator!