Modern Vespa

Hi all. Just started riding again after the winter. I had to share the battery tender between my 2022 Prima 150 and my convertible, and I'm afraid the Prima got the short stick.

Rode a few times during the winter and it started up and ran like a champ. Last week I realized that it had been a long time since it was charged, so I left the charger on for about 5 days. Then when I tried to start it, it at first seemed to not want to at all, like in dead battery. But then it kept turning over faster and faster until it eventually did start.

I rode it to the gas station and put all new gas in it. Again, it was very hard to start. Takes about 10 seconds of turning over, which feels like an eternity. And now, the check engine light also came on. It seems to be getting a little easier to start it now, but still nothing like before. And the engine light stays on.

Any ideas? Does it have a regular port like a car that I can stick my code reader in? Thanks!

Yes.

You'll need the adaptor cable in this thread and then any code reader will work.

(the elm32 bluetooth adapter combined with a phone app that I mention there is because it's cheaper than a traditional reader and also doesn't require batteries so I like to chuck in the toolkit I keep with the bike)

GUIDE: How to read Engine Fault Codes (OBD/OBD2)

It has a diagnostics port, but it takes an adapter to connect to the standard 16-pin connector on an OBD reader. I'm not sure that measures battery voltage anyway. I would just use a multimeter to measure the battery voltage. It should be at least 12.6 volts with the engine not running. A low battery could account for the check engine light.

This is incorrect info for a 2022 Primavera 150. They need to follow DIY Diagnostic tool for injection Vespa's with MIU ECU