Earlier this year I posted about our 99 E320 shutting off and was advised to install a new crank position sensor. We finally bit the bullet and took

it to Brumos MB in Jacksonville where they scanned it. We were told it was instead the mass air flow sensor so we had it replaced. Well that has not cured the problem and now the check engine light is on (it was not on before). We are looking at trading cars and would like to have the MB in good shape for max trade allowance. Any sure fire solutions to be offered??
Thanks,
Bobbo