E 320 BLUETEC (211.022) V6-3.0L DSL Turbo (642.920) (2007)
of DPF and downstream of DPF.
The differential pressure between the exhaust gas pressures upstream and downstream of DPF has an effect on the piezo resistant pressure sensor
element.
This generates a voltage, which is reinforced by the integrated silicon chip and is passed on as a voltage signal to the CDI control unit.