I went to start the engine on my 96 E300D. Once the engine started, I got a check engine light. I then used my scan tool to check. It came out a P0403 code + a statement reads: "EGR Flow ckt malfunction".
What could be wrong?

Could the EGR flap has lot of build up? I just clean the whole Intake manifold, EGR flap.. 3000 miles ago this past summer.

BTW. It was 38 degree F when I started the engine.

THX

P0403 Exhaust Gas Recirculation Circuit Malfunction

I would check the wiring to the egr valve.

http://www.buellwinkle.com/MBOBD2.html

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

I'll do it tomorrow. thx

For the benefit of the community, I've solved the problem.

Took the EGR valve, mixing chamber and the corrugated pipe apart. I scaped all the soot out, cleaned them with injector cleaner. Put them back, started the engine. The P0403 code still came back. I then used my Actron OBD II scanner to ERASE the code. It is gone. Have not seen it back.

Note. I did scrape and cleaned the electrical connection to the EGR valve as suggested. No help.

Hope someone can benefit from my experience.