TLIBZ

Hey guys, I have a 2004 E55 AMG. Just bought it a month or so ago. Yesterday it was a bit chilly (50 degrees) and I had the heat on. Randomly my Check Engine Light came on and my center vents were blowing cool air. The driver and passenger side vents were blowing normally. Anyone know what this could be? Also, any idea why my CEL came on? I had my sec cats and resonators deleted with an x pipe in place of the secondaries. Could the cold weather throw a CEL??

Thanks!

G_Money

The center vent is supposed to blow cold air. It has it's own adjuster knob for that. I think all German cars do it. As far as the CEL, I dunno. Do you have a code reader?

TLIBZ

Really?? It started blowing warm air afterwards, after I turned the ac off then back on...

And I don't have a code reader, but I'll probably go to Autozone or one of those auto stores and let them read the code.

Hulk

Change over valve, pretty easy to change, use this DIY but remove the wiper linkage , much easier

https://mbworld.org/forums/e-class-w...rol-valve.html

Cel can be caused by the cats removal

TLIBZ

Thanks! The A/C rarely ever acts up. Sometimes it'll automatically turn off the recycling function after about 30 mins. Don't know why.

And I'm guessing maybe the secondary cats & resonator removal with an x pipe + the cold weather is causing a change in the exhaust flow? Maybe that's why? Wont know until I use the scanner and find out for sure.

SICAMG

No. The o-2 sensors are before the second cats so they have no effect on the MIL light. Just scan it for codes and see.

TLIBZ

Just did. Gave me a P0456 code. Most likely a bad gas cap. It said "very small leak"

viren.89

Oh lol ! Congrats ! This is the legendary code- could be fuel sending unit-

small leak at the gas tank (got my diagnosed at the dealer recently)

or just a fuel cap.

But you are covered now since the class-action lawsuit just settled.

https://mbworld.org/forums/w211-amg/...4-12-23-a.html

mawaleegulu

The recirculation light automatically turns off to let fresh air into the cair read the manual -_-