My 99 ML430...100k miles...just died on the freeway. Dealer says CPS needs replacement. After a search, I think that the $550 to diagnose and repair the issue sounds high. How about new pads and rotors for the front for $600?

Have they pegged me as the guy who will pay anything?

I had the car towed to the dealer because it was my only real option, by the way.

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" I feel much better ever since I gave up
hope."

Crank position sensor replacement should take anyone working on MB's less that an hour! & the part lists for around $110. Diagnosis shouldn't take more than an hour......total $300-400. MAX.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Under $100 online.
One bolt ( star fitting if i recall) to replace.
takes 60 seconds to fix ( the 2nd time ).

CPS -
if no luck then the Mass Flow Air sensor another $100 easy easy fix.

__________________
Steve Danville
what i did myself.
CPS
rear shocks
MAS x 3.
SparkPlugs (twice)
Fuel pump & Filter
Window switch
replaced both failed horns with Honda horns.
Cleaned ERG Tube
Oil changes
Oil consumption Fix
Brake Pads
A/C Recharge
Anti-Freeze change X 2.
Front Shocks. Monroe. $90
Mercedes Warrenty Work:
Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s
Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles