I have a 2003 C240 (W203) with an active P0400 DTC triggering my Check Engine light. It is the only code active (using a generic code scanner).
I'd like to know if there are any ways to troubleshoot the engine to determine WHAT is actually causing the code. Per my diesel mechanic brother's thoughts - this could actually be caused by the EGR being clogged, the EGR tube being clogged, an electrical fault somewhere in the wiring with the EGR, the Oxygen Sensor (O2 Sensor), or something else.
How can I determine what the actual cause is?
I'd like to know if there are any ways to troubleshoot the engine to determine WHAT is actually causing the code. Per my diesel mechanic brother's thoughts - this could actually be caused by the EGR being clogged, the EGR tube being clogged, an electrical fault somewhere in the wiring with the EGR, the Oxygen Sensor (O2 Sensor), or something else.
How can I determine what the actual cause is?
