So you have 4 lights:
- Top left - Oil pressure. If it comes on with the engine running, means big issues
- Top center - Charging light. If it comes on with the engine running, means you have an issue with the battery charging system.
- Top right - It's the air filter restriction warning light. Tells you the filter is clogged and needs to be cleaned out with compressed air or replaced. Usually a good cleaning is enough
- Bottom center - Water temperature. Will turn on if the engine is overheating.
Now for the air filter light still turning on, could either be a wire that is broken or is loose. Without the air filter, it shouldn't be on since there is virtually no restriction.