Question about 1998 Mercedes-Benz C-Class

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Power Loss Mercedes 220 cdi '98 Trouble code P1403

I have problem with my 220 cdi '98. Trouble code says P1403 (exhaust gas recirculation - HFM-regulation).

I cleaned the EGR valve completely and changed the hot film meter but nothing changed. On the highway the car drives smooth, but once the car turns on idle it switches to secure mode and I lose all power.

To reset it I have to turn off the engine and re-start.

Any idea what can cause this?


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It sounds like you have a vacuum leak somewhere between your valve and your source. A common vac leak that occurs on the 220 is at the vac. rubber y located at the back of the intake manifold. Follow your vac. line from the egr to the switchover valve and from the switch over valve to the source. Which is probably the y connecter

Posted on May 29, 2009

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I have exactly the same problem with my MB E290TD. The same DTC, also changed MAF, also need to torn of the engine for 5-10 sec to get the engine running well. And I checked all vacums - they are all good.
Also I have changed egr transducers (both of them) for two times, didnt helped.
Cleaned and checked for holding vacum EGR, good - didnt helped.
It seems like a mechanical problem that affects the electronic seestem - but i can not figure out what ir is.
The strange thing is that you can tur engine on in the morning and it can imediatly cach the foult. But there are days that you can drive all dai long and the car will run fine. That pises me off. Because I have done everything that can be done - but NO ONE can tell the exact explonation of the P1403 (exhaust gas recirculation - HFM-regulation). Every explonation is a quess.?

Posted on Apr 23, 2012

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