As the manual states 80% of efi problems are wiring related. The tbap(map sensor) connector and wiring was the most common problem we had on the efi machines. When code 45 shows up,usually a good sign this is the problem. Sensor connector pins can pull out,wires may look good but can be melted internally. Look at the "sticky" post on 700/800 efi problems in the Polaris expert section as it tells about this and also shows a link to get better harness repair kits than what Polaris offers. Sensors are usually not the problem unless tampered with.https://otbpowersports.com/products/
Look at this one.https://otbpowersports.com/product/t...epair-harness/
Also some codes may be bogus(21) and code "61" just means the end of the code sequence.