So I FINALLY checked the codes with my UG. P1456, and P1163.
P1456 on IC net.
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P1456 is indeed called the loose gas cap code.
More specifically its Evap leak, fuel tank area. In some unusual cases other more expensive items have (usually) been damaged.
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I believe it is from running the tank so low. Will now be filling up at around a quarter tank left, at least shooting for that. I will make sure I fill up by 1-2 bars, at the very latest.
P1163 on IC net.
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But the fault and fix still lies with the EGR valve.
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This suggests the EGR valve, so I may have an actual issue with the EGRv. I cleared them, and will see how it works out. I may be learning how to clean my EGRv soon!
Are those other images working?