nedaj6789

I have 98 ML320. Has anyone worked this model for a P0400 code? My mechanic has replaced the EGR valve, and front and rear O2 sensors. Check engine light still comes on after 20-30 mi. Any ideas on what needs to be checked/replaced next? I am tired of my mechanic guessing and hoping fellow posters/readers would have some insight into this growingly expensive problem.

cobracop

this fixed my p0400 problem, took 5 min. no more check engine light