Never, ever disable the EGR without removing the DPF. You risk a huge thermal runaway inside the DPF and likely a DPF fire. The ECU controls the temperature of the DPF once in regeneration by controlling the amount of oxygen flow to it. If the DPF receives too much oxygen once the regeneration has started, you risk a thermal runaway and the core will likely melt because the ECU cannot control the temperature in the DPF core. Particularly if the doser flap is disabled also, that's about the worst possible situation.
Also, the ECU knows the flow through the EGR system - even EDC15 has the ability to throw plausibility faults with relation to low EGR flow. It knows by monitoring the drop in flow via the MAF as the valve opens, the doser closes and it forces exhaust gasses through the system instead.
Also, the ECU knows the flow through the EGR system - even EDC15 has the ability to throw plausibility faults with relation to low EGR flow. It knows by monitoring the drop in flow via the MAF as the valve opens, the doser closes and it forces exhaust gasses through the system instead.
