The ECU seems to have an issue with bank 1 and may see it off timing for some reason and wont let you start to protect motor.
But when bank 1 signal is completely missing it uses bank 2 to work out timing for bank1 (only an approx.)and runs in limp mode. Which is why it cranks for longer.
You may have an issue with the variable valve timing on bank 1 or even jumped a tooth on the timing chain. Or ECU/wiring issues.
Could be few others things as well.
Your best to take car to an auto electrician
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