Got a check engine light and the car seems to be running on reduced power. Took it to AutoZone and they said they weren't getting any Volvo specific codes. It looks like the ODBII code was P2178. For other brands, it looks like that is "too rich off idle - right bank."<p>I have an appointment at the closest dealer in a few days. Our dealer closed and now the closest one is 40 miles away. I'd like to get some idea of what might be a likely cause.<p>Fuel pressure? Emissions? MAF?