1999 Yaris, No spark! help please 🙏

[B.B._07]

Your airbag code is not the cause of your no spark, no start condition (but don't expect your airbag to work until you get that issue resolved). I'm fairy certain that an '99 Euro Yaris doesn't have an ECU immobilizer with the chip key since the US/Canadian models did not include that feature until '08. If you're not getting spark I would look further into the ignition system. From the pictures I've looked at it looks like the 1.0 SZ engine has ignition coils so check them for melting, cracks in the insulation, and carbon tracks. Also why did you replace the ECU when replacing the ignition lock barrel and key? If there is a plastic black ring with wiring around the ignition lock barrel than that's for a chipped key. Did your '99 originally have this black plastic ring around the ignition lock barrel?