Well, CarMax now tells me that it's a bad fuel pump causing these codes. I asked if they were using a code scanner to come to this conclusion. They said yes, that they are using the very same one that Mercedes uses. If that is the case, couldn't they see any abnormalities in fuel pressure coming from the fuel pump? Couldn't they check for pressure at the fuel pump? It's almost like they are just guessing and replacing parts. The service tech was confident when he said it was the fuel pressure regulator. Then he said it's the fuel pump. I would bet that once he replaces the pump, he's going to finally get around to tell me it's the MAF. -Norm
Quote:
Originally posted by nbml430
I'm still a little concerned about how long it's taking CarMax to get around to the repairs. It's been about 2.5 weeks that the Check Engine light has come on. It will take another week for CarMax to order the part and schedule an appointment. I suspect that this is the wrong diagnosis anyway and will take yet another week to order the correct part and install it. Is there any danger of damaging any other component(s) due to a faulty mass air flow sensor? Also, how long and how difficult is it to install a fuel pressure regulator? Thanks again for your help. -Norm
|