What does fault code 28b mean on a 2007 sprinter van?

Fault code 28B on a 2007 Sprinter van typically indicates an issue related to the exhaust gas recirculation (EGR) system. This code can point to problems such as a malfunctioning EGR valve, blocked passages, or issues with the EGR cooler. It's essential to diagnose the specific cause, as it can impact engine performance and emissions. A thorough inspection and possibly a scan of related systems may be necessary for accurate troubleshooting.