Q: Q: Check engine light staying on

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My check engine light came on a few weeks ago. I took it to a repair shop and they ran a code scan and it came back with the code ECM 211A. After doing a full diagnostic, they couldn't find the problem. Car runs fine and there are no fuel smells. Check engine light goes on and off. Been driving it this way for 3 weeks. Is it safe to keep driving it like this?

My car has 130000 miles.
My car has an automatic transmission.

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