OceanView

I got a check engine light today so I hooked up the OBD II.
It reads P0496 - EVAP Emissions High Purge Flow Fault.
Anyone know what this is?

hgerhardt

Fuel cap off or loose? That would certainly cause high purge flow.

OceanView

I checked that and it was on as tight as it would go, although it could be the seal.

spjackso

would bad gasoline make that light come on just got that code shortly after I filled up at a turkey hill gas station. I normally use BP/RICKERS premium But was running low on Christmas eve and evthing was closing early so I gave it a shot.

CEB

Open gas cap, close it again. The code will probably clear in a few days of driving.

If it happens shortly after gassing up then it is most likely the gas cap.

spjackso

Ill try a new gas cap and see if that works I ran the old gas almost completely out then refilled with bp premium but light still on. someone @ AutoZone told me to try dumping a can of sea foam and a lil bit of fuel stablelizer to the gas tank. have u heard of that b4. thx 4 ur help

CEB

No need for a new gas cap or additives. Just retighten the cap and drive for a week.

CEB

You might want to take a look at both the cap and the filler tube to see if they are clean.

spjackso

change the gas cap and light went off for a week then came back on s**t.
went back to AutoZone and got the same code p0496 but this time it said check the following.


purge or vent solenoid failure


plugged evap canister condition


failed evap pressure sensor


can anyone shoot me a diagram or tell where these parts are located on vehicle and any advise on what I should start with first. thx ev1 for your help.


2010 E550 4matic Sedan
65k

jahquan3

I had similar code come up but never got a CEL or anything from it alone. Or to clarify, I had a misfire from a bad ignition coil giving me a CEL but once I replaced ignition coil CEL never came back. Even though I was advise to get similar parts to the ones you've mentioned replace at that same time.
Idk what they look like or where they are located exactly, I can say the parts and labor ran me about 1k to get fixed based on the estimate they gave me. So I said if no CEL comes back I'm gonna leave it. I have a buddy whose a mechanic and he said it's apart of the emissions system and if I needed to pass inspection, I'd probably fail if these codes are still there or if this is a real issue. Luckily I got inspected a couple of months beforehand so I'm good for two years

He did tell me a few other things but this was a couple months back so I forget all of it but he did say a CEL should come back if it was really major issue. I can grab the printout for the estimations per part if you like when I get home to my car binder that I keep.

Oh one other thing, I was getting serviced at STS and they told me those parts can only be bought from the dealer. So they may have charged me a little more in the estimate since they were going to pick the parts up from the dealer for me.

I have a 2010 E550 RWD 107K Miles

degeja

after tightening gas cap- reset with OBD II instrument for immediate light out.

michael3158030

I have the same problem on my R350 2008, it not gas cap, I checked, its not purge valve, I have replaced this too, may be charcoal canister?
I have not checked this yet, any other ideas?

Sunnyslope48

E5Fly

Did you ever figure this out? My CEL is on, tested purge solenoid valve, not an issue. Gas cap was tightening past one click so I replaced it and cleared the code. Stayed clear and gas mileage was fine for about a week. Came back on and gas mileage is back to being horrible. I don't smell any fuel near the rear quarter panel, no leaks, no problems filling up. Anyone have any ideas or solutions? Thank you in advance!